evolve: revision graph

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tests: add some basic testing of progress
Tue, 23 Apr 2019 10:20:03 -0700, by Martin von Zweigbergk
evolve: increment progress *after* a whole merge commit is done
Fri, 19 Apr 2019 10:03:39 -0700, by Martin von Zweigbergk
evolve: use util.acceptintervention() for closing transactions
Fri, 19 Apr 2019 11:02:35 -0700, by Martin von Zweigbergk

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