[MERGE] Fix WorkingTree.remove for tree-references and non-cwd trees

[Aaron Bentley]

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Aaron Bentley wrote:
> WorkingTree.remove doesn't work properly with tree references, because
> it uses isdir to determine whether a path is a directory, and then calls
> tree.walkdirs.  That mixes "inventory kind" and "disk kind" inappropriately.

Could someone please review this?

http://bundlebuggy.aaronbentley.com/request/%3C4655B1B7.4060702%40utoronto.ca%3E

Aaron

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