Thu, 15 Mar 2018 22:43:35 +0100 wenzelm more comments;
Thu, 15 Mar 2018 22:41:59 +0100 wenzelm tuned message -- more readable JSON;
Thu, 15 Mar 2018 22:28:20 +0100 wenzelm more accurate isabelle_id: parent directory is not necessarily at tip;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -3 +3 +10 +30 +100 +300 +1000 +3000 tip