[MERGE] BranchBuilder updates

[Aaron Bentley]

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John Arbash Meinel wrote:
> The one thing it doesn't support is "merge" because our merge code
> depends on having a real disk backing the WorkingTree.

I don't think that's accurate.  Merge works fine with a PreviewTransform
as the target, and I'm working on PreviewTree to make it acceptable as a
source.  PreviewTree/PreviewTransform do hit disk, but this an
implementation detail that can easily be changed.

> It also doesn't
> support "rename" yet, because MemoryTree doesn't.

PreviewTree does support rename.  Perhaps it would make sense to use it?

Aaron
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