[MERGE] Move dpush logic onto InterBranch

[Jelmer Vernooij]

This patch moves the logic from dpush to InterBranch.lossy_push().
This makes the names a little bit more sensible (Branch.lossy_push rather
than Branch.dpull). 

A followup to this patch should make it possible for foreign branch
implementations to override the rebasing process that happens during
dpush after the lossy push. This is useful for bzr-git which can be
optimised (the same pack that is generated and sent during the lossy push just
needs to be processed, no need to retrieve it again from the server).

Furthermore, this patch is required for things like dpushing from git
into subversion, setting the right magic bits for git-svn.

Cheers,

Jelmer
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