evolve: revision graph

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debugobsconvert: make sure obsstore is loaded before version comparison
Mon, 21 Sep 2015 22:30:44 +0900, by Yuya Nishihara
evolve: use repo._bookmarks.recordchange instead of repo._bookmarks.write
Wed, 16 Sep 2015 16:50:06 -0700, by Laurent Charignon

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