evolve: revision graph

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cleanup: replace .parents()[0] by .p1()
Thu, 19 Dec 2019 22:31:13 -0800, by Martin von Zweigbergk
evolve: add more tests for --continue case when relocating "divergent"
Wed, 27 Nov 2019 20:54:48 +0530, by Sushil khanchi
evolve: use meaningful variable names for a return value
Wed, 27 Nov 2019 19:50:33 +0530, by Sushil khanchi

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