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branching: merge with stable
Fri, 14 Jul 2017 03:16:06 +0200, by Pierre-Yves David
prev: allow to update to 't0' from 't1'
Fri, 14 Jul 2017 02:46:28 +0200, by Pierre-Yves David
topic: add a 'topicidx()' to context
Fri, 14 Jul 2017 02:42:33 +0200, by Pierre-Yves David
prev: retrieve the 'no-topic' result is a clear and reusable option
Fri, 14 Jul 2017 02:41:53 +0200, by Pierre-Yves David

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