evolve: revision graph

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evolve: add test to demonstrate a bug when no active topic stable
Fri, 20 Dec 2019 17:32:07 +0530, by Sushil khanchi
evolve: fix a bug in logic of choosing destination for hg update stable
Fri, 20 Dec 2019 17:31:57 +0530, by Sushil khanchi

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