Remove XML prolog from CP error pages
Error pages sould not start with the XML prolog <xml ...> since IE6/win tries to parse them as an XML file... and fails miserably. ;(
BTW, XML prolog isn't needed at all by XHTML (see http://tantek.com/XHTML/Test/minimal.html)
Bonus feature: trackback should be HTML-escaped before sending it to the browser -- i've have funny looking trackbacks caused by non-escaped HTML elements.
Reported by deelan