evolve: revision graph

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test-compat: merge mercurial-5.4 into mercurial-5.3 mercurial-5.3
Thu, 11 Mar 2021 13:27:18 +0800, by Anton Shestakov
test-compat: merge mercurial-5.5 into mercurial-5.4 mercurial-5.4
Thu, 11 Mar 2021 13:18:30 +0800, by Anton Shestakov
tests: remove in-memory evolve cases (not supported prior to 5.6) mercurial-5.5
Thu, 11 Mar 2021 12:51:00 +0800, by Anton Shestakov

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