Fri, 29 Jun 2018 14:02:14 +0200 wenzelm always consolidate: allow errors in presentation;
Fri, 29 Jun 2018 11:36:31 +0200 wenzelm proper build_heap;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 tip