During the CVS imports into Bzr, there were some inconsistencies introduced
(mostly that files that were deleted in CVS weren't being deleted in Bzr).
So this checkin makes the bzr repo actually consistent with the CVS repo,
including fixing permissions of files.

Bug 519584: Implement a framework for migrating from other bug-trackers, and start with a GNATS importer.
Patch by Max Kanat-Alexander <mkanat@bugzilla.org> (module owner) a=mkanat