evolve: revision graph

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next: move logic to evolve the children to it's own function
Fri, 16 Mar 2018 11:56:50 +0530, by Pulkit Goyal
next: prompt user to choose a children in case of ambiguity
Fri, 16 Mar 2018 11:46:47 +0530, by Pulkit Goyal
next: show changeset hash in `--dry-run` instead of rev numbers
Fri, 16 Mar 2018 11:31:13 +0530, by Pulkit Goyal

less more | rev 3548: (0) -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 tip