evolve: revision graph

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evolve: use utility._singlesuccessor() in _solveunstable()
Sat, 07 Dec 2019 23:13:40 +0530, by Sushil khanchi
evolve: preliminary indentation
Wed, 18 Dec 2019 16:21:37 +0100, by Pierre-Yves David
evolve: provide cache argument to obsutil.successorssets() correctly stable
Fri, 03 Jan 2020 23:12:19 +0700, by Anton Shestakov

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