[issue8999] Add Mercurial support to patchcheck

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Updated. I also changed two sets to lists, to retain usage. I’m sure that Mercurial won’t print the same filename twice, and I’m nearly sure Subversion won’t either. Retaining order will make the report a bit more readable.

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Added file: http://bugs.python.org/file17748/hg-support.diff

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