evolve: revision graph

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tests: allow an empty merge commit to have tests pass without too many changes stable
Mon, 27 Jan 2020 14:55:35 +0700, by Anton Shestakov
compat: add a context manager that calls _quick_access_changeid_invalidate() stable
Tue, 28 Jan 2020 20:12:04 +0700, by Anton Shestakov
evolve: provide branch argument to overlayworkingctx.tomemctx() stable
Fri, 17 Jan 2020 20:40:24 +0700, by Anton Shestakov

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