- Update to 2.0

 * Now tracks changes to OPTIONS settings, and the effect those
 have on port dependencies.

 * Cleanup of warning and error messages -- new 'Warnings'
 configuration variable to turn them on/off

 * New 'Strict' configuration option -- at the moment this just
 enforces a check that all ports are referenced from the
 category Makefile in the directory above. May be extended to
 other items later.

 * New 'CrunchWhitespace' configuration option -- emulate the way
 that 'make index' collapses multiple whitespace into single in
 port description lines.

 * Internal changes to data structures, cache file locking
 etc. which will be needed to support multithreaded cache
 initialization / update (It is coming... eventually). One
 consequence is that there is no longer a dependency on
 Storable.pm

 * Mk/bsd.commands.mk and Mk/bsd.destdir.mk added to the list of
 Makefiles where changes are not expected to affect the INDEX.

 * Bugfix -- correct programming error when picking out changes to
 lists of SUBDIRs in category Makefiles.

 Note: You will have to reinitialize the ports cache when updating.
 Unfortunately, due to the changes in BerkeleyDB locking / concurrent
 access, version 2.0 code cannot even open the version 1.9 data cache.

PR:		115222
Submitted by:	Matthew Seaman <m.seaman@infracaninophile.co.uk> (maintainer)

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