evolve: revision graph

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packaging: require hg 4.5 also for usage, not just for building stable
Thu, 13 Jun 2019 13:19:44 +0800, by Anton Shestakov
packaging: require mercurial >= 4.5 stable
Tue, 11 Jun 2019 10:04:11 +0200, by Philippe Pepiot
evolve: clarify why returning by adding inline doc
Sat, 08 Jun 2019 16:03:05 +0530, by Sushil khanchi

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