Use System PHP library for the which command
Use constants.
Add todo
Don't throw an exception when removing a PINGABLE collection that doesn't exist.
Fix phpdoc
Remove erroneous, duplicate code.
Not needed
Better sizing of mailbox drag ghost object
More/fix unit tests
Fix serialization of boolean false
Lower default compression threshold
initialize compress object in constructor
Make sure Horde_Pack object is never serialized
Bump version for release.
Released Horde_Pack-1.0.0
Development mode for Horde_Pack-1.0.1
Fix tests
Remove one debug warning when strict checking is active
typo
Merge branch 'master' into imp_6_2

Conflicts:
	imp/docs/INSTALL