evolve: revision graph

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evolve: warn user if cset desc is being lost
Sat, 09 Mar 2019 19:25:34 +0530, by Sushil khanchi
changelog: mention latest improvement
Sun, 10 Mar 2019 18:00:08 +0100, by Pierre-Yves David
stack: make @ (current) more important than $ (some sort of unstable)
Sun, 10 Mar 2019 18:50:00 +0800, by Anton Shestakov

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