evolve: revision graph

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docs: change `troubles` references to `instability`
Sat, 27 Apr 2019 19:42:42 -0400, by Matt Harbison
docs: change `precursors` references to `predecessors`
Sat, 27 Apr 2019 19:32:03 -0400, by Matt Harbison
docs: import figure diagrams with inkscape 0.92
Sat, 27 Apr 2019 14:42:48 -0400, by Matt Harbison
messages: standardize on "working copy is now at" including "is"
Thu, 25 Apr 2019 15:14:21 -0700, by Martin von Zweigbergk
evolve: move more of the progress-related variables together
Thu, 25 Apr 2019 13:58:29 -0700, by Martin von Zweigbergk
evolve: delete dead calculation of number of troubled revisions
Thu, 25 Apr 2019 14:02:11 -0700, by Martin von Zweigbergk

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