copies: rewrite copy detection for non-merge users The existing copy detection API was designed with merge in mind and was ill-suited for doing status/diff. The new pathcopies implementation gives more accurate, easier to use results for comparing two revisions, and is much simpler to understand. Test notes: - test-mv-cp-st.t results finds more renames in the reverse direction now - test-mq-merge.t was always wrong and duplicated a copy in diff that was already present in one of the parent revisions

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  $ hg init

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  $ echo a > a

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  $ hg add a

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  $ hg commit -m test

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Do we ever miss a sub-second change?:

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  $ for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20; do

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  >     hg co -qC 0

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  >     echo b > a

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  >     hg st

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  > done

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