evolve: revision graph

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tests: put a common template snippet into [templates]
Sun, 07 Jun 2020 17:56:03 +0800, by Anton Shestakov
tests: remove "unused" second argument to join() template function
Sun, 07 Jun 2020 17:48:16 +0800, by Anton Shestakov
tests: drop label from log template in test-evolve-obshistory-amend.t
Sun, 07 Jun 2020 17:45:13 +0800, by Anton Shestakov

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