Sat, 03 Sep 2011 08:01:49 -0700 huffman shorten some proofs
Fri, 02 Sep 2011 20:58:31 -0700 huffman remove redundant simp rules ceiling_floor and floor_ceiling
Sat, 03 Sep 2011 22:05:25 +0200 wenzelm misc tuning and simplification of proofs;
Sat, 03 Sep 2011 21:15:35 +0200 wenzelm Document.removed_versions on Scala side;
Sat, 03 Sep 2011 19:47:31 +0200 wenzelm discontinued predefined empty command (obsolete!?);
Sat, 03 Sep 2011 19:39:16 +0200 wenzelm discontinued global execs: store exec value directly within entries;
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