> trying to "upgrade" from one branch of Bugzilla to a newer branch
What do you mean by "upgrade"? Do you want to integrate the changes from both branches into a single branch, or just switch to using the new branch? i.e. perhaps you want "bzr switch" rather than "bzr merge"?
Also, you say you're:
> trying to "upgrade" from one branch of Bugzilla to a newer branch
What do you mean by "upgrade"? Do you want to integrate the changes from both branches into a single branch, or just switch to using the new branch? i.e. perhaps you want "bzr switch" rather than "bzr merge"?