Sat, 05 Jan 2013 18:36:02 +0100 wenzelm proper return code on window close;
Sat, 05 Jan 2013 17:38:54 +0100 wenzelm more precise Local_Theory.level: 1 really means main target and >= 2 nested context;
Sat, 05 Jan 2013 17:24:27 +0100 wenzelm more direct property names;
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