[MERGE] TreeTransform avoids many renames when constructing trees

[Aaron Bentley]

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Aaron Bentley wrote:
> Ian Clatworthy wrote:
>> Aaron Bentley wrote:
> 
>>> This patch implements the top-rename strategy for TreeTransform, so that
>>> building a tree only renames files in the top-level directory.
>> Cool!! Initial feedback below.
> 
> Here's an updated patch incorporating most of Ian's suggestions.

Doh!  Wrong patch.  Correct ones attached.

Aaron
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