------------------------
New features:
- ``priority`` command: set the priority of the given bugs.
- ``comment`` command learned the ``--which`` argument, for limiting
output to only the given comment(s).
- ``search`` learned the ``--version`` argument.
- ``edit`` command: edit the product version of a bug.
Bug fixes:
- ``search`` command: fix crash when zero bugs returned
Other changes:
- ``-V`` replaces ``--version`` for displaying program version
information.