fix for test_sparql_equals.py.  Added check for URIRef instances in mapToOperator cascade and a deprecation warning about __repr__ for python 3000
fix for test_sparql_equals.py.  Added check for URIRef instances in mapToOperator cascade and a deprecation warning about __repr__ for python 3000

marma/rdflib,avorio/rdflib,marma/rdflib,ssssam/rdflib,avorio/rdflib,RDFLib/rdflib,dbs/rdflib,marma/rdflib,armandobs14/rdflib,yingerj/rdflib,armandobs14/rdflib,yingerj/rdflib,marma/rdflib,yingerj/rdflib,RDFLib/rdflib,ssssam/rdflib,avorio/rdflib,dbs/rdflib,RDFLib/rdflib,avorio/rdflib,armandobs14/rdflib,ssssam/rdflib,yingerj/rdflib,armandobs14/rdflib,dbs/rdflib,RDFLib/rdflib,ssssam/rdflib,dbs/rdflib