[MERGE] Memory tree with format parameter

[John Arbash Meinel]

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Robert Collins wrote:
> This allows tests that need a specific branch and repository format to
> ask for that when asking for a MemoryTree.
> 

Robert and I had looked over this, and it makes some other tests much
nicer, so I'd like to see it merged. (It has my +1 already :)

John
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