evolve: revision graph

graph

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evolve: store the replacements occurred during `hg evolve` at top level
Tue, 16 Jan 2018 17:14:32 +0530, by Pulkit Goyal
evolve: make the _solve* functions return a tuple
Sat, 27 Jan 2018 16:13:19 +0530, by Pulkit Goyal
evolvestate: rename the file to state.py and class name to cmdstate
Wed, 17 Jan 2018 19:12:32 +0530, by Pulkit Goyal

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