[merge] update --revision

[Matthieu Moy]

Robert Collins <robertc at robertcollins.net> writes:

> I think this code is more complex than needed. Why not just resolve the
> revision that is desired from the master branch if there is one or the
> local otherwise rather than trying for it locally then remotely. This
> will be more understandable too, because the master should be
> authoritative for this.

The idea is to use the local branch as much as possible, for
performance reason. "bzr update -r something" should be a local
operation if "something" is already in the local branch.

-- 
Matthieu