evolve: revision graph

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obslog: remove the separate "obslog -f" implementation and use the common one
Tue, 25 Feb 2020 18:07:30 +0700, by Anton Shestakov
obslog: provide successors and multiple markers to marker-displaying function
Tue, 25 Feb 2020 17:47:54 +0700, by Anton Shestakov
obslog: make date template property into dates
Tue, 18 Feb 2020 18:16:11 +0800, by Anton Shestakov

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