Sun, 02 Nov 2014 16:39:54 +0100 wenzelm modernized header;
Sun, 02 Nov 2014 16:09:35 +0100 wenzelm more flexibile \setisabellecontext, independently of header;
Sun, 02 Nov 2014 16:05:43 +0100 wenzelm prefer explicit heading command;
Sun, 02 Nov 2014 15:27:37 +0100 wenzelm uniform heading commands work in any context, even in theory header;
Sun, 02 Nov 2014 13:26:20 +0100 wenzelm eliminated dead code;
Sat, 01 Nov 2014 20:19:07 +0100 wenzelm clarified syntax -- avoid overlap with command category;
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