Sat, 19 May 2018 16:13:39 +0200 wenzelm clarified store.clean_output: cleanup user_output_dir even in system_mode;
Sat, 19 May 2018 15:45:45 +0200 wenzelm clarified store directories;
Sat, 19 May 2018 14:52:01 +0200 wenzelm tuned;
Sat, 19 May 2018 14:47:54 +0200 wenzelm clarified handling of output heap;
Sat, 19 May 2018 14:12:44 +0200 wenzelm tuned;
Sat, 19 May 2018 11:57:41 +0200 nipkow added lemmas
Fri, 18 May 2018 21:50:46 +0200 wenzelm more abstract database access;
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