Log Message:
Update to 1.68:

1.68pre

   - compilation problem fixes

1.67
   - many bugfixes (rt.cpan.org)
   - added XML::LibXML::Pattern module and extended pattern support in Reader
   - added XML::LibXML::XPathExpression module that can pre-compile an XPath \ 
expression
   - reimplementation of the thread support (mostly by Tim Brody)
   - structured errors XML::LibXML::Error
   - memory leak fixes
   - documentation fixes
   - README - notes for building on Win32 (C.J. Madsen)