PATCH: RevisionTree gets a branch, not a store

[Johan Rydberg]

Hi,

This seemed like a good cleanup.  Just some low hanging fruit.  

But I would like to refactor the code a bit so that RevisionTree does
not know anything about what kind of history format is used.  Maybe we
can add a "get_file" (or something) method to Branch that takes a file
id and a revision id and returns a file-like object. Any ideas?

~j

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