evolve: revision graph

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compat: update hg-X.Y compat comments and test them
Tue, 10 Mar 2020 19:05:08 +0700, by Anton Shestakov
contrib: add a script to check release in compat comments that have node hash
Tue, 10 Mar 2020 19:04:33 +0700, by Anton Shestakov
changelog: add an entry about the cleanup
Tue, 10 Mar 2020 11:50:40 +0100, by Pierre-Yves David
evolve: drop compat for pre-4.5 context.memfilectx()
Mon, 09 Mar 2020 18:47:18 +0700, by Anton Shestakov

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