Convert-UUlib

Changes for version 1.8

no bugfixes in this release due to lack of known bugs, but the major changes in this release might have introduced new bugs, so watch out.
update large decoder example to disable OPT_AUTOCHK and use Smerge -1.
some micro-optimisations.
avoid costly string comparisons by comparing hashes when isnerting items, which speeds up insertion by a constant factor.
improve uulist (and other) structure layout and size.
reverse the order of file list items, which heuristically improves match speed with large usenet file lists.
use getc instead of fgetc, which makes no difference on gnu/linux.
clean up _FP symbol names toi not start with an underscore.
use feof_unlocked and ferror_unlocked.
implement a faster ascii-only strnicmp.
misc very minor code improvements.
remove quite a bit of pre-posix/dos/etc. cruft.
use flockfile, if available, for a potential but small speed gain.
speed up inner yenc decoder loop.
kentnl said that this module should no longer claim to be a simple interface to uulib, as the bunndled copy is now better maintained than the original upstream library.

decode uu/xx/b64/mime/yenc/etc-encoded data from a massive number of files

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