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

[Jelmer Vernooij]

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
-- 
Jelmer Vernooij <jelmer at samba.org> - http://samba.org/~jelmer/
Jabber: jelmer at jabber.fsfe.org
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