evolve: revision graph

graph

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precheck: update the orphan message to something me generic
Sun, 23 Jul 2017 19:45:28 +0200, by Pierre-Yves David
precheck: point to the instability doc when aborting
Sun, 23 Jul 2017 19:53:51 +0200, by Pierre-Yves David
evolve: document the various instability/troubles
Sun, 23 Jul 2017 19:52:06 +0200, by Pierre-Yves David
precheck: also check for unstability creation
Sun, 23 Jul 2017 19:37:29 +0200, by Pierre-Yves David

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