nanocomment: comment scripts for use with nanoblogger

2.1 (16 August 2007):
   - Added an option to validate comment bodies with RELAX-NG, which does not
     require as new a version of libxml2 as the XML-Schema method.

2.0 (4 July 2007):
   - Made Typekey authentication optional
   - Added Trackback support
   - Added a check for [url] tags in comment data, since these seem to be
     common in comment spam

1.0 (19 December 2006):
   - Initial release