Completed port to use list2set for managing SPARQL variable binding results
Completed port to use list2set for managing SPARQL variable binding results

git-svn-id: 60eb48102d1ca0c284ab3654bef916b01e1b221b@1034 4f84a9ca-5c3e-0410-8a68-0bdf370325d5

nwebs/rdflib