[MERGE] Move implementation of update_revisions() from BzrBranch to Branch

[John Arbash Meinel]

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Jelmer Vernooij wrote:
| The attached patch moves the implementation of update_revisions() from
| BzrBranch to Branch. The implementation doesn't use private functions
| and can be used by derived classes (such as SvnBranch) as well.
|
| Cheers,
|
| Jelmer
|

BB:approve

update_revisions is really only a wrapper around set_last_revision_info() with a
safety check anyway.

And it already has a proper branch_implementation test.

John
=:->
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