K 10
svn:author
V 5
dougb
K 8
svn:date
V 27
2010-07-22T22:42:53.453104Z
K 7
svn:log
V 555
Add the --clean-packages[-all] feature

This works similarly to --clean-distfiles[-all] in that it searches
the $PACKAGES directory for out of date packages, and either offers
to delete them, or with -all deletes them without prompting. It also
cleans out stale symlinks and empty directories.

This necessitates moving init_packages_var() and parse_index() so
they can be used by the new feature.

The idea for grabbing the ORIGIN from the package's +CONTENTS file
and checking to see if it is up to date came from:
Alexey Markov <a.markov@complitex.ru>

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