evolve: revision graph

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rewind: abort if some parts of a fold are unknown locally
Tue, 22 Dec 2020 19:07:46 +0800, by Anton Shestakov
rewind: abort when trying to rewind to multiple unrelated predecessors
Tue, 22 Dec 2020 19:06:36 +0800, by Anton Shestakov
rewind: walk obsmarkers and add more targets to rewind to
Tue, 22 Dec 2020 19:03:59 +0800, by Anton Shestakov

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