evolve: revision graph

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evolve: move the evolve command to evolvecmd.py
Fri, 19 Jan 2018 19:32:34 +0530, by Pulkit Goyal
evolve: move _orderrevs() function evolvecmd.py
Sun, 21 Jan 2018 20:33:39 +0530, by Pulkit Goyal
evolve: move builddependencies() and _singlesuccessor() to utility module
Sun, 21 Jan 2018 20:28:06 +0530, by Pulkit Goyal

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