[XML-SIG] added ParsedXML DOM test suite

[Martin v. Loewis]

> I've just added the ParsedXML DOM unit test suite to PyXML; to run them
> (and discover the nice hangs and errors) run xml/test/test_pyxmldom.py,
> which in turn runs the various tests in xml/test/domapi.

Thanks! I'll included in PyXML 0.7, although I won't take much effort
to let it pass in some way.

Regards,
Martin