evolve: revision graph

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split: handle bookmarks instead of leaving them on precursor
Sat, 08 Aug 2015 12:42:57 -0700, by Laurent Charignon
split: don't update before it is actually needed
Sat, 08 Aug 2015 12:45:36 -0700, by Laurent Charignon
split: add more output to the test
Sat, 08 Aug 2015 12:16:55 -0700, by Laurent Charignon

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