put on a person or on a bug. Some of the group bits control access to bugzilla
features. And a person can't access a bug unless he has every group bit set
that is also set on the bug.
now choose whether to let submitters of new bugs choose a priority, or whether
they should just accept the default priority (which is now no longer hardcoded
to "P2", but is instead a param.) The default value of the params will cause
the same behavior as before.