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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  $ rm -rf a

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  $ hg init a

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  $ cd a

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  $ echo a > a

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  $ hg ci -Am0

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  adding a

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  $ hg tag t1 # 1

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  $ hg tag --remove t1 # 2

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  $ hg co 1

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  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

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  $ hg tag -f -r0 t1

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  $ hg tags

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  tip                                3:a49829c4fc11

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  t1                                 0:f7b1eb17ad24

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