[MERGE] Reduce the number of round trips required to create a repository over the network.

[Robert Collins]

This includes a couple of separate branches so I couldn't get a good
bundle out of it :)

However they are small, so it shouldn't be an issue.

Anyhow, with this, initial push of a trivial branch to a bzr+ssh server
is now 75-100 round trips. Andrew and I should get the stream code
integrated into our branch tomorrow, where we can see how much that
reduces it (and it will certainly reduce the number of RPC calls for
non-trivial branches, which is a *much* more interesting use case).

-Rob
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