Add core copy detection algorithm This adds findcopies, which detects merge-relevant copies between files in a pair of manifests back to the merge ancestor. While the merge code invokes the copy detection routine, it does not yet use the result.

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%% Should show unknown

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? unknown

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removing b

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%% Should show unknown and b removed

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R b

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? unknown

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%% Should show a and unknown

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a

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unknown