Thu, 10 Jul 2008 17:26:25 +0200 wenzelm added Isar.undo, which emulates old-style undo on global tty state;
Thu, 10 Jul 2008 17:26:23 +0200 wenzelm provide old-style undo operation (still unused);
Thu, 10 Jul 2008 17:26:22 +0200 wenzelm added prompt markup;
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