evolve: revision graph

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evolve: drop the "computing new diff message" for phase-divergence
Tue, 26 Mar 2019 12:30:10 +0100, by Pierre-Yves David
evolve: clarify output when phase-divergence resolution results in no change
Wed, 20 Mar 2019 09:19:02 -0700, by Martin von Zweigbergk

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