evolve: revision graph

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evolve: provide branch argument to overlayworkingctx.tomemctx()
Fri, 17 Jan 2020 20:40:24 +0700, by Anton Shestakov
changelog: mention all the cleanups as one item
Wed, 08 Jan 2020 18:44:18 +0700, by Anton Shestakov
templatekw: drop obsfatedata and related code
Wed, 08 Jan 2020 15:34:34 +0700, by Anton Shestakov

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