evolve: revision graph

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changelog: add relevant entries
Wed, 30 Jan 2019 04:45:40 +0100, by Pierre-Yves David
evolve: add test for the case where public divergence on difference parents
Tue, 22 Jan 2019 18:40:10 +0530, by Sushil khanchi
evolve: update the public divergence resolution logic to cover --continue case
Mon, 21 Jan 2019 23:06:10 +0530, by Sushil khanchi

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