[MERGE] TreeTransform avoids many renames when constructing trees

[Aaron Bentley]

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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.

I've also included a patch with just my most recent changes.

Aaron
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