Sat, 27 Jun 2009 22:14:13 +0200 wenzelm more detailed platform identification;
Sat, 27 Jun 2009 19:24:34 +0200 wenzelm isabelle_path: slightly more liberal root pattern;
(0) -30000 -10000 -3000 -1000 -300 -100 -30 -10 -2 +2 +10 +30 +100 +300 +1000 +3000 +10000 +30000 tip