added priorVersion link to daml+oil

Following the example in 6. Ontology Versioning
http://www.w3.org/TR/2004/REC-owl-guide-20040210/#OntologyVersioning

The OWL namespace document has been updated to show daml+oil
as a priorVersion of OWL.

 http://www.w3.org/2002/07/owl
 $Date: 2004/09/24 18:12:02 $

-- 
Dan Connolly, W3C http://www.w3.org/People/Connolly/
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