[MERGE] Refactor diffing

[Aaron Bentley]

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Robert Collins wrote:
> I'm really happy with this code. The only remaining thing I think could
> be improved would be for the factory signature to take DiffTree rather
> than the individual trees. Then DiffKindChange can share the signature
> and there's no need to special case it.

I've added a from_diff_tree factory to each Diff class.  But as you can
see, it doesn't simplify things too much.

Aaron
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