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Documentation: dropped the overflow: auto declaration for pre elements since Firefox has some nasty problems viewing the doc pages with it.

- Added Sensei_Exception

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* Fixed a few layout bugs in new documentation
* Fixed documentation table of contents indentation bug in IE6 (fixes #344)
* Fixed a parser bug in Sensei_Doc_Section
* Restructrured a bit some files of the documentation.

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fixing the XSL sheets to use the programlisting XSL files in the svn repos. This really is quite a nasty way of doing it - absolute paths should not be in SVN, not sure how to fix it yet

Sorry for the trigger happy commits, but with each one I'm
actaully trying to fix some post-commit script magic :)