BerkeleyDB

Changes for version 0.07

Numerous small bug fixes.
Added support for sorting duplicate values DB_DUPSORT.
Added support for DB_GET_BOTH & DB_NEXT_DUP.
Added get_dup (from DB_File).
beefed up the documentation.
Forgot to add the DB_INIT_CDB in BerkeleyDB.pm in previous release.
Merged the DBM Filter code from DB_File into BerkeleyDB.
Fixed a nasty bug where a closed transaction was still used with with dp_put, db_get etc.
Added logic to gracefully close everything whenever a fatal error happens. Previously the plug was just pulled.
It is now a fatal error to explicitly close an environment if there is still an open database; a database when there are open cursors or an open transaction; and a cursor if there is an open transaction. Using object destruction doesn't have this issue, as object references will ensure everything gets closed in the correct order.
The BOOT code now checks that the version of db.h & libdb are the same - this seems to be a common problem on Linux.
MLDBM support added.
Support for the new join cursor added.
Builds withe Berkeley DB 3.x
Updated dbinfo for Berkeley DB 3.x file formats.
Deprecated the TxnMgr class. As with Berkeley DB version 3, txn_begin etc are now accessed via the environment object.