Jing update + test suite

A new version of Jing is available.  This is intended to fully conform to
the RELAX NG Committee Spec. Also new in this release, Jing uses the
datatype interface from SourceForge.

Separately available is a test suite for the RELAX NG spec, with over 300
tests.  It's far from perfect, but should be quite helpful for implementors
working on validators.

The XHTML and XSLT RELAX NG schemas have also been updated.

All the above are available from

 http://www.thaiopensource.com/relaxng/

No support yet for the DTD Compatibility Spec.  I hope to add that soon.

James