[MERGE] Tree.revision_tree

[Robert Collins]

Hi,
* Add a new method ``Tree.revision_tree`` which allows access to cached
  trees for arbitrary revisions. This allows the in development dirstate
  tree format to provide access to the callers to cached copies of 
  inventory data which are cheaper to access than inventories from the
  repository.
  (Robert Collins, Martin Pool)


Cheers,
Rob

-- 
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