VSESPB / App-MtAws-1.115 / ChangeLog

### 2014-05-26 v1.115

  * Fixed - crash/error when uploading large files with partsize=1024, when "old" Digest::SHA (< 5.63; shipped with most
  of current linux distros) is installed. Old Digest::SHA has a bug, there was a workaround for it (i.e. message asking
  to upgrade module) when it's used with large files on 32bit machines, but apparently seems 64bit machines
  also affected.
  Now a message removed, instead workaround code written so it now works with old buggy versions fine (i.e. splits large
  chunks into smalled ones when feeding Digest::SHA).

  * Since v1.113 Ubuntu Raring 13.04 PPA is discontinued (due to End of Life of Ubuntu Raring, launchpad PPA stopped
  building binaries for it)

### 2014-02-20 v1.114

  * Fixed: a crash with message:
  UNEXPECTED ERROR: archive XXXXXX...XXX not found in archive_h

  mtglacier was crashing if --filter/--include/--exclude options applied, and a file, previously deleted in
  Journal (i.e. with --purge-vault or --delete-removed) excluded by this filter.

  i.e. when file deleted, a record about deletion is appended to Journal (and previously there was a record
  about creation). when journal is read, creation record is skipped (because filters applied), but deletion record was
  not checked by filter. thus mtglacier detected it problem with journal consistency (attempt to delete unexistant file)

### 2014-02-01 v1.113

  * Fixed: Y2038 problem with file modification time in metadata (i.e. journal and Amazon Glacier servers).
  Some OSes and filesystems don't support years after 2038 (i.e. Linux 32bit)
  Some perl versions don't support handling dates after 2038 (i.e. 32bit perl before 5.12 and
  64bit perl 5.8.8 (RHEL5), 5.10.0 (some SUSE))

  There is not much sense in having files with file modification after Y2038 or before Y1902, however such file can
  appear in filesystems due to bugs in other software etc.

  Fixing now inconsistency in behaviour with such metadata between different OS/perl versions.

  After this fix file modification time will be restored correctly from Amazon servers to journal (via download-inventory)
  on all platforms, for all years in range 1000-9999.

  However if your OS/filesystem does not work with such dates, anything except correct date in journal file
  is not guaranteed.

  Before this fix, such dates could result in lost of filenames and modification time in journal (filename replaced
  with random token) when restoring inventory (you are affected if you uploaded file on 64bit system with date
  after Y2038, but then restored on 32bit system).

  * Documentation: Also, note about Y2038 added to "Limitationss" section.

  * CSV inventory parsing - making it 30% slower, but more consistent with what Amazon documented about its format
  https://forums.aws.amazon.com/thread.jspa?threadID=141807&tstart=0

  * Cosmetic changes to docs

  * CPAN install - on some systems like ARM, some NAS, 32bit OSes decrease number of concurrent tests during install.
  Might help preventing out-of-memory problems (but makes test slower).

### 2014-01-14 v1.112

  * PPA package for Ubuntu 14.04 added to Ubuntu PPA (+ fixes in metadata of Debian/Ubuntu packages)

  * Workaround: 31 December 2013 Amazon introduced extension to inventory retrieval API: now one can request for just
  a part of inventory. This, however, can break mt-aws-glacier behaviour in rare circumstances i.e. when you use 3rd
  party app to request a part of inventory and then run mt-aws-glacier to get full inventory, mt-aws-glacier can
  download partial inventory instead of full. (details here https://forums.aws.amazon.com/thread.jspa?threadID=143107).

  Releasing workaround now - mt-aws-glacier now tried to check if this is a full inventory (it's still possible for the
  bug to appear very-very rare circumstances i.e. if 3rd party app will request for part inventory with limit set and
  then request for continuation without any limits).

  Also, now all inventory jobs raised by mt-aws-glacier have special marker. In the future versions bug will be fully
  fixed as all non-mtglacier jobs will be disabled.

  * Fixed several brittle tests introduced in v1.110, preventing mtglacier from install via CPAN on some systems:
  - systems with perl 5.18.1, 5.18.2 and stock version of Digest::SHA
  - old systems (i suspect RHEL5 without any CPAN modules installed) with old version of File::Temp
  - Cygwin

  * Documentation: Warning about incompatibility of metadata added to Must Read section

  * Documentation: Fixed - installation instructions for Debian via custom repository improved - lsb_release command,
  used in install instruction, was not a part of (some?) minimal Debian installs. So some users experienced problems
  installing mtglacier first time. I suspect users who use FISH shell were affected too.

### 2013-12-20 v1.111

  * Brittle test fixed (i386, old Digest::SHA)

### 2013-12-20 v1.110

  * Compatibility: upload-file with --filename option behaviour slightly changed:
  both --filename and --dir now resolved to full paths, before determining relative path from --dir` to --filename`
  So f you have `/dir/ds` symlink to `/dir/d3` directory, then `--dir=/dir` `--filename=/dir/ds/file` will result in
  relative filename `d3/file` not `ds/file`. Previously you would get d3/file. Also now all parent directories has
  to be readable.

  * Documentation: documentation for upload-file updated.

  * Fixed: #63 internaly mtglacier was using absolute filenames when reading/writing file in filesystem, even if user
  specified relative. Seems that was wrong. Undex Unix file can be readable by relative name but unaccessible by real,
  absolute name if path components of this name are unreadable. Fixed now - always use relative filenames in all commands
  except upload-file command (where it's documented that absolute names are used).
  This change does not affect relative filenames stroed in journal or amazon glacier metadata in any way.
  This change might affect filenames format that you see in mtglacier output.

  * Fixed: some bugs related to directory traversal under old-old perl installations (RHEL 5.x, when no new
  CPAN modules installed) worked around.

  * Fixed: upload-file with --filename and --dir were not working correctly for most of perl installations
  if dir started with "..". This due to bug https://rt.perl.org/Public/Bug/Display.html?id=111510 in File::Spec module.
  Currently upload-file behaviour changed (see above in ChangeLog) so  mtglacier not affected. In previous versions this
  would result in wrong relative filenames in journal and Amazon glacier metadata
  (precisely, those filenames are without path prefix, as if they would be in current directory, otherwise filename
  part is correct).

  * Workaround: Digest::SHA perl module prior to version 5.62 calculates SHA256 wrong on 32bit machines, when data
  size is more than 2^29 bytes. Now mtglacier throws an error if --partsize >= 512Mb and machine is 32bit and digest-sha
  version is below 5.62. Commands which don't use --partsize are unaffected.

  * Fixed: Amazon CSV format parsing: Amazon escapes doublequote with backslash but.. does not escape backslash itself.
  https://forums.aws.amazon.com/thread.jspa?threadID=141807
  This format is undocumented and broken by design. Fixing parser now to parse this.
  this bug was not affecting any real use of mtglacier as mtglacier does not use backslashes in metadata and ignores
  foreign metadata.

  * Cosmetic changes to process manager code

### 2013-12-14 v1.103

  * Fixed: issue #48 download-inventory was crashing if there was a request for inventory retrieval in CSV format
  issued by 3rd party application. mt-aws-glacier was not supporting CSV and thus crashing.
  It's hard to determine inventory format until you download it, so mt-aws-glacier now supports CSV parsing.

  * Fixed: download-inventory command now fetches latest inventory, not oldest

  * Added --request-inventory-format option for retrieve-inventory commands

  * Documentation: updated docs for retrieve-inventory and retrieve-inventory and download-inventory commands

### 2013-12-10 v1.102

  * Fixed: memory/reasource leak, introduced in v1.100. Usually resulting in crash after uploading ~ 1000 files ( too
  many open files error)

  * Minor improvements to process termination code

### 2013-12-08 v1.101

  * Fixed: CPAN install was failing for non-English locales due to brittle test related to new FSM (introduced in 1.100)
  Also error message when reading from file failed in the middle of transfer was wrong for non-English locales.

  * Added validation - max allowed by Amazon --partsize is 4096 Mb

  * Fixed: --check-max-file-size option validation upper limit was wrong. Was: 40 000 000 Mb; Fixed: 4 096 0000 Mb

### 2013-12-07 v1.100

  * Nothing new for end users (I hope so ). Huge internal refactoring of FSM (task queue engine) + unit
  tests for all new FSM + integration testing for all mtglacier commands.

### 2013-11-30 v1.059

  * Fixed: Dry-run with restore completed was crashing.
  Fixed a bug introduced in v0.971
  dry-run and restore-completed used archive_id instead of relative filename and thus was crashing with message:
  UNEXPECTED ERROR: SOMEARCHIVEID not found in journal at ... /lib/App/MtAws/Journal.pm line 247.

### 2013-11-08 v1.058

  * Fixed - when downloading inventory there could be Perl warning message ("use initialized ..") in case when some
  specific metadata (x-amz-archive-description) strings (like empty strings) met. Such metadata can appear if
  archives were uploaded by 3rd party apps.

  * Fixed possible deadlock before process termination (after success run or after Ctrl-C), related to issue
  https://rt.perl.org/Ticket/Display.html?id=93428 - select() is not always interruptable. Issue seen
  under heavy load, under perl 5.14, with concurrency=1 (unlikely affects concurrency modes > 1 )

  * Fixed - when deprecated option for command (say, --vault for check-local-hash) was found in config, there was a
  warning that option deprecated, however that should not happen, because everything that is in config should be
  read only when such option required (you should be able to put any unneeded option into config)

### 2013-10-15 v1.056

  * mtglacier now can be installed via Ubuntu PPA - install instructions updated.

### 2013-09-25 v1.055

  * Fixed: sync --replace-modified were not deleting old files in Amazon Glacier in case --detect option causing a check
  of treehash before upload.
  Affected workflows:
   --detect=treehash - when file actually uploaded after check
   --detect=mtime-and-treehash (i.e. default --detect) - when file actually uploaded after check
   --detect=mtime-or-treehash when mtime is same but treehash differs and thus file actually uploaded
  Not affected workflows:
   when file size differs and thus file uploaded,
   --detect=mtime-or-treehash - when mtime differs and thus file uploaded
   anything else not listed above.

  * More fixes to installation instructions

  * Cosmetic fixes to --detect documentation

### 2013-09-03 v1.051

  * Installation instructions reworked

  * Alpha testing on Cygwin platform

### 2013-08-31 v1.050

  * Optimized Journal memory usage by 12%

  * Fixed: system error messages (i.e. ERRNO - like Permission denied etc) where clobbered on non-English locales (i.e.
  when message is not ASCII-7bit). Error messages and check-local-hash output were affected.

  * CPAN/Cosmetic: testsuite does not produce strings which looks like a warnings anymore.

### 2013-08-27 v1.000

  * After one year since first public version released, beta testing now finished and version 1.000 released.
  Current project status is non-beta, stable.

  * New version scheme: 1.xyz (x - major change or major internal change, y - new version, z - tiny fixes)

  * Internal changes. Nothing new.

### 2013-08-06 v0.981 beta

  * Fixed possible problems with mtglacier process termination under OpenBSD 5.1. Fixed possible install problem (test
  suite failure) under OpenBSD 5.1

### 2013-07-30 v0.975 beta

  * Fixed: files with content "0" caused crash (unexpected error), issue #42

  * Documentation: small update for Fedora install instructions

  * When downloading from glacier, temporary files were created, download performed, then temp files were renamed to
  target filename (this is atomic), then target file attributes were adjusted and file modification time changed.
  Now chmod/mtime performed before file is renamed. So more atomic now.

  * Fixed: File::Temp required version decreased, so can work on perl-5.8.8 without upgrading this module

  * Internal: Code to work with temporary files reworked, testsuite added. IPC small refactoring + testsuite added.

### 2013-07-21 v0.974 beta

  * Deprecations (deprecated options produce warning, and can start producing errors some day)
  --to-dir, --from-dir deprecated in faviour of --dir
  --from-vault, --to-vault deprecated in faviour of --vault
  --dir for command purge-vault
  --vault for command check-local-hash

  * Documentation: Installation instructions polished (for RHEL + warnings about manual installation)

  * Enhancement: "version"/"--version" command, prints mtglacier version (probably useless, as it printed in any way),
  and prints versions of all used modules. Useful to attach with bug-reports.

  * Enhancement: mtglacier now checks versions of every loaded module runtime, in case of mess with install.

### 2013-07-13 v0.973 beta

  * mt-aws-glacier can now be installed using CPAN tool. Docs updated with installation instructions.

  * Config file now detect config syntax errors better and reports it together with file name and line number

  * Config options without values (follow, dry-run, stdin, new, replace-modified, delete-removed) can now be used in
  config file

  * Enhancement: sync now acception --follow - follow symbolic links, documentation updated.

  * Enhancement: --detect now accepts new value "size-only"

### 2013-07-10 v0.972 beta

  * FSM potential bug fixed, can lead to possible instability

  * FSM bug fixed - with --concurrency=1 it was not deleting old archives after upload replacements

  * Enhancement: --detect now accepts new value "always-positive"

### 2013-07-09 v0.971 beta

  * Enhancement: sync command now can synchronize modified files or propogate deletions (backward compatibility
  with previous command line API preserved) - see documentation for sync command (--new, --replace-modified,
  --delete-removed, --detect options)

  * Compatibility: journal format modified. only backward compatibility preserved, no forward compatibility (i.e. if you
  use this version once and modify journal, you can't downgrade)

  * check-local-hash output minor changes

  * Now compatible with ancient versions of LWP::UserAgent (5.803+ ) in HTTP mode, such versions shipped with
  CentOS 5.x (or maybe even 6.x). Note that that does not mean that ancient versions of LWP are stable ;)

  * Enhancement: mtglacier now raises error "Journal is from future version of mtglacier" if journal cant be parsed and
  it seems that it's from future.

  * Internal changes: prepare for implementing file versioning, prepare for publishing as CPAN distribution, improved
  test suite

### 2013-06-26 v0.963 beta

  * Fixed - restore-completed sometimes restore existing files when filesystem-encoding is not UTF-8  and filename contains non-ASCII characters

### 2013-06-05 v0.962 beta

  * Enhancement: 'timeout' option added for network socket timeout and documentation updated. Default timeout
  changed from 120 to 180 seconds

  * Detection of Amazon Glacier ThrottlingException

  * Better handling of server closing connection, after headers sent, for download-inventory as well

  * Better handling of server closing connection, after headers sent, for all other types of requests

  * Finally defined in README and code minimum Perl version required - 5.8.8 (pretty old, AFAIK there are no
  supported distributions with older Perls)

  * Reading and parsing Journal file optimized (~ 2 times faster for UTF-8 filenames, and ~3 times faster
  for ASCII-only filenames)

### 2013-06-01 v0.961 beta

  * Enhancement: segment-size option added for restore-completed command for multi-segment downloads

  * Documentation: restore-completed documentation updated

  * Enhancement: Now all downloads performed to temp files. Temp file renamed to real files only when download succeed.

  * Fixed: If server closes connection, after sending headers (when downloading files), this was not detected and no
  error was thrown (it's not reported by underlying HTTP library for case non-chunked-transfer)

  * Fixed: some other errors from underlying HTTP library detected

  * Fixed: it there was more than 100 retries for a request (due to timeout/etc), program now terminates with error,
  instead of reporting success.

  * Fixed: for systems with non-UTF-8 filesystems, file modification time sometime was not adjusted after files
  downloaded with restore-completed command

  * Fixed: SIGHUP added to list of signal for graceful handling (i.e terminate fast when you close terminal)

  * Fixed: Exceptions error message placeholder were not resolved when error printed

### 2013-05-26 v0.957 beta

  * STS/IAM security tokens support added

  * Documentation: typo fixed - setup instructions was incorrect - need to install LWP::Protocol::https instead of
  LWP::Useragent::https (LWP::Protocol::https is a typo, and does not exists)

  * Documentation: described behavior of restore and restore-completed commands

### 2013-05-26 v0.956 beta

  * Fixed - 'Restore' command now skips retrieval of files, which were retrieved by mtglacier in last 24h (retrievals
  tracked in Journal using system clock). Also existing files skipped. Previous behavior was: skip only existing files.

  * Some more error handling in HTTP processing

### 2013-05-26 v0.955 beta

  * Fixed - timeout error from underlying HTTP Library was not detected

### 2013-05-19 v0.954 beta

  * Fixed bug - when child worker terminated with a signal, it's possible that STDOUT buffers won't be flushed, and
  as some error messages were printed to STDOUT they was truncated in this case.

### 2013-05-19 v0.953 beta

  * Error messages added if detect journal from future version of mtglacier. Also other errors in parsing
  line properly handled.

  * Error message added - refuse to work with journal files where last line does not end with LF (or CRLF). That could
  mean journal is truncated/damaged.

  * Possibility to work with Journal files, which use CRLF as line separator

  * Error message (instead of unexpected error) added for case when filenames are too big (limit
  is 700 ASCII or 350 2-bytes UTF-8). Limitation section updated for this case in README.

### 2013-05-19 v0.952 beta

  * Some error handling rework. Errors for file opens (permissions problems), invalid characters in filenames, some misc
  errors, are thrown with sane error message and helpful information

  * Some more internal changes related to internal IPC protocol

  * Documentation: 'Limitations' section added.

### 2013-05-09 v0.951 beta

  * Bug fixed: In previous version (v0.944) a bug was introduced when downloading inventory (download_inventory_command).
  If inventory size (JSON encoded) was more than 999999 bytes (~1Mb), download failed with a message:
  "unexpected end of string while parsing JSON string, at character offset NNNNN (before "(end of string)")
  at ... /lib/App/MtAws/LineProtocol.pm line 42. (notice LineProtocol.pm, other file will mean different issue)

  * download_inventory command CPU and memory usage optimized

  * Some internal changes related to internal IPC protocol

### 2013-04-30 v0.944 beta

  * Better signal/program termination handling.
  Signal number has hardcoded, so on (some?) (non-linux?) systems that was a different signal, resulting in
  core dump after successful program termination (signal with default action core dump)
  Also previously, after termination mtglacier were sending much more signals to it child processes, than
  required for communication, this could result in segfault it Perl (again, after successful termination)

  * Reworked messages when mtglacier terminated (with Ctrl-C or exception)

  * select() call was not protected from EINTR, this could case crash in rare circumstances (for example if ran
  under "truss -f" on FreeBSD (strace -f analog)

  * There was a mix of select()/eof() and buffered IO in Perl code, this could lead to bugs in the future.

  * Protect IO calls from possible EINTR to avoid possible Perl
  bug http://www.perlmonks.org/?node_id=1026468 http://www.perlmonks.org/?node_id=1026542

  * Workaround a Perl "feature": When terminal-encoding set to single-byte encoding (i.e. under *BSD), whole thing
  can hang (with 100% CPU) if random data (i.e. user files content, non UTF-8 filenames, binary hashes) printed to
  STDERR (i.e. a stacktrace after error) https://rt.perl.org/rt3//Public/Bug/Display.html?id=117537

  * Documentation: This ChangeLog reformatted for better readability

  * Documentation: Journal Concept section added https://github.com/vsespb/mt-aws-glacier#journal-concept

  * Documentation: --from-dir was changed to --dir and --to-vault changed to --vault (in code this change was several
  versions ago. both options are valid now. --from-dir and --to-vault will be deprecated soon)

### 2013-04-27 v0.943 beta

  * Debug code added to troubleshoot issues #28,#33:
  If MTGLACIER_DEBUG_INVENTORY=1 is set, download-inventory command
  will write two log files: _download_inventory_body.log and _download_inventory_headers.log with
  request/response headers and response body

### 2013-04-09 v0.942 beta

  * Regression fixed - print user friendly error message in case Permission Denied errors.

### 2013-04-07 v0.941 beta

  * Regression fixed - A code which prints user friendly error message, in case HTTPS libraries are not installed,
  was not working.

  * leaf-optimization option added (default is on).
  Allows to disable file tree traversal leaf-optimization for (some? broken?) CIFS/CD-ROM filesystems

### 2013-03-19 v0.936 beta

  * File selection implemented (see "File selection options" in README)

  * --dry-run command implemented

  * Bug fixed - it was impossible to use some options in config (like 'from-dir' 'to-vault'). Internally
  those were option aliases.

### 2013-03-18 v0.935 beta

  * Fixed - check-local-hash should not crash on 0-size files (even though normally there should not be any)

### 2013-03-18 v0.934 beta

  * Better handling of IO errors in 'check-local-hash' command - print error, continue with other files,
  return exit code 1 in the end.

### 2013-03-13 v0.933 beta

  * Fix crash in 'help' command, bug was introduced a day ago.

  * New version numbering for beta versions - 0.9XY. Where 'X' is a month number of year 2013. 'Y' is number a of
  a release in this month. So 0.933beta is 3rd release in April 2013

### 2013-03-12: v0.89 beta

  * Single-byte character encodings support for *BSD systems added (see "Configuring Character Encoding") in README.

  * When uploading from STDIN and file is empty, don't create Amazon Glacier upload id before throwing error

### 2013-03-04: v0.88 beta

  * upload-file command implemented (upload from STDIN or single upload from file). See README.

  * Internal: New Config Engine (config/command line options processing) - will help implement
  advanced functionality in the future

  * Fix possible crash when read(2) system call can return partial result,
  see http://www.perlmonks.org/?node_id=435814

### 2013-02-23: v0.87 beta

  * More verbose error message if we found broken UTF-8 in filenames

  * More verbose error message in case of permission problems when reading files from disk

  * Error checking for key/secret/region format added

  * Some minor internal changes and test improvements

### 2013-01-29: v0.86 beta

  * Bug fixed: when doing retrieval or delete, crash after successful finishing (only happened
  when concurrency=1). Regression of bug fixed in 0.76beta.

  * Changed project file structure. Modules moved to lib/App/MtAws

  * mtglacier.pl now deprected, use mtglacier

  * Now you can execute mtglacier command from any directory, or create a symlink to it - it will find
  other package files by itself

  * Minor fixes in help command output and cosmetic changes

### 2013-01-28: v0.85 beta

  * Create/delete vault support

### 2013-01-28: v0.84 beta

  * HTTPS Support added

  * Bug fixed: Some (UTF-8) metadata characters was
  double-encoded (however it can be read without problems)

  * Compatibility - Amazon Glacier Metadata: only backward compatible with previous versions.

  * Documentation improvements

  * Error checking improved when reading config file

### 2013-01-21: v0.83 beta

  * Bug fixed. File modification time 1970-01-01T00:00:00Z0 (i.e. epoch time = 0 ) was causing crash when
  uploading and missing file report when check-local-hash

  * Main script: Changed shebang from /usr/bin/perl to /usr/bin/env - this will
  allow Mac Port users to work out of the box

  * Main script: Cosmetic changes in --help output

  * Documentation: added names of CentOS packages, better example of config
  file, cosmetic changes, fixed spelling mistakes

### 2013-01-12: v0.82 beta

  * retrieve-inventory/download-inventory commands added. You can now restore journal file
  from scratch, from Amazon Glacier metadata

  * Now when downloading files from glacier - restore original modification time

  * Fixed - File modification time - date before 1970 were not working

  * Improvement in error checking command line parameters

  * Error checking added for read/write availability of journal file

  * Internal: improvements to unit tests

### 2013-01-02: v0.81 beta

  * Error handling when parsing command line implemented + --help command

  * Security - considering filenames coming from "external" sources (from Glacier and from Journal file)
  as unsecure. Sanitize/check it.

  * Some internal changes to TreeHash implementing (does not affect
  working code, but needs for future enhancements)

  * Dependency removed - MIME::Base64::encode_base64url (implemented in 2010 in
  MIME::Base64), This function is re-implemented. So we can use older versions of this module.

### 2012-12-27: v0.80 beta

  * Storing Amazon Glacier metadata (x-amz-archive-description) when
  upload files implemented (using custom format).

  * More verbose output for check-local-hash command

  * Internal: Huge testsuite improvements

  * Internal: Refactored: command-line options
  processing, Glacier requests code, main program, misc

  * New Journal format: added support of file modification time, added journal
  version makers (software fully works with old journal files)

### 2012-12-07: v0.78 beta

  * Full internal UTF-8 support introduced. Can use wide characters in filenames, command line options

### 2012-12-05: v0.77 beta

  * Replace File::Path::make_path with legacy method File::Path::mkpath so it's compatible now with
  older perl distribution (File::Path 1.08 CentOS 5.8)

  * fixed problem when relative filenames start with "0" character

### 2012-11-21: v0.76 beta

  * Retrieval work improved: Can use more than just 50 first retrieval jobs (walking job list
  pagination). Requesting only completed job list,	so use fewer requests.

  * Fixed bug when restore process crashed after successful finishing (only happened when concurrency=1)

  * Documentation fixes: Installation instructions improved. Help/Contribute section added.

### 2012-11-17: v0.75 beta

  * Bug fixed when signature not calculated
  right with retrieve requests (bug found in 0.74 after SHA256 optimization)

  * Increased internal limit for maximum in-progress files while uploading (was 3 now 30)

### 2012-11-15: v0.74 beta

  * Improved CPU usage apprx 30% - 1) SHA256 was calculated twice sometimes 2) In case data chunk < 1 MB we can
  use that TreeHash is equal to SHA256

  * Debug code removed, which were causing failing requests in 20% cases

  * Some refactoring

### 2012-11-15: v0.73 beta

  * Sign request right before sending to network. Fixing the following 1) when request is retried due to 408/500 error,
  we resign it, thus timestamp won't expire 2) put all heavy operations like SHA calculation before signature/timestamp
  calculation

  * Some legacy code removed

### 2012-10-24: v0.72 beta

  * Some effort to manage mtglacier version information, print version each run. Report version in HTTP
  UserAgent string.

  * Show some progress when reading large local directory listings

  * Retry with throttling 408/500 HTTP requests. 408 can mean timeout/bad bandwidth. 500 means Amazon not ready yet.

  * Some old unused code removed

  * Option --max-number-of-files now works with "sync" and limits number of files to synchronize

  * More verbose output

  * For certain commands like Sync read only not-yet-synced filenames into memory (saves memory when working
  with huge filesets)

  * Use Journal module to handle journals and file listings + unit test the module

### 2012-08-28: v0.7 beta

  * initial release



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