Tue, 04 Oct 2016 18:09:23 +0200 wenzelm earlier build_history_base: timing properties in log are introduced here;
Tue, 04 Oct 2016 15:42:08 +0200 wenzelm incremental output;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 tip