[MERGE] Add ForeignBranch

[Jelmer Vernooij]

The attached patch adds a simple ForeignBranch class, as it is used at
the moment as base class for the Branch classes in bzr-svn and bzr-git.

Cheers,

Jelmer

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