[MERGE] Add BranchBzrDirInter.push()

[Andrew Bennetts]

Jelmer Vernooij wrote:
> On Wed, Apr 01, 2009 at 04:26:25PM +1100, Robert Collins wrote:
[...]
> > But like a say, It looks to me like its _very_ close to not being needed
> > and instead a simple method on BzrDir will do what you need.
> What about the attached patch? I wasn't sure how to name the method on
> BzrDir, so I've named it "push" for now, suggestions for better names
> are welcome.

It helps to attach the patch ;)

-Andrew.