[MERGE] RemoteBranch uses inefficient revision_id_to_revno

[John Arbash Meinel]

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Aaron Bentley wrote:
> John Arbash Meinel wrote:
>> So, what would be a good way to make RemoteBranch.revision_id_to_revno
>> fast, without having to duplicate all of the code in Branch6/7?
> 
> It seems like the best options are:
> - delegate to the underlying Branch

Done in attached.

Basically, this lets the different implementations use the best method.
It is probably a small step backwards to avoiding VFS operations, but it
will make *my* life with branches bound over the network a bit better.

John
=:->
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