Sat, 18 Jun 2011 12:13:42 +0200 wenzelm tuned markup;
Sat, 18 Jun 2011 11:45:07 +0200 wenzelm more uniform treatment of "keyword" vs. "operator";
Sat, 18 Jun 2011 11:22:03 +0200 wenzelm simplified Line_Context (again);
Sat, 18 Jun 2011 00:05:29 +0200 wenzelm more robust treatment of partial range restriction;
Sat, 18 Jun 2011 00:03:58 +0200 wenzelm select_markup: no filtering here -- results may be distorted anyway;
Fri, 17 Jun 2011 23:20:34 +0200 wenzelm more explicit treatment of ranges after revert/convert, which may well distort the overall start/end positions;
Fri, 17 Jun 2011 23:18:22 +0200 wenzelm more explicit error message;
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