[MERGE] Add InterBranch.push().

[Jelmer Vernooij]

This patch moves the functionality of Branch.push() to InterBranch.push(), 
so it can be overridden when necessary. For example, this is useful for bzr-svn
so it provide a faster push.

Similar to my InterBranch.pull() patch, this patch duplicates some of the tests 
for Branch.push() for InterBranch.push(). It might be useful to trim the 
Branch.pull() tests if this lands.

Cheers,

Jelmer
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