Quoted Literal Datatype is not Unquoted in NTriples parser

[white-gecko]

With test/nt/quote-01.nt:

<http://ar.dbpedia.org/resource/\u0625\u0643\u0634\u0627\u0641_\u0645\u062B\u0627\u0646\u064A> <http://ar.dbpedia.org/property/meshnumber> "12.74"^^<http://dbpedia.org/datatype/nicaraguanC\u00F3rdoba> .

and text/nt/quote-02.nt:

<http://ar.dbpedia.org/resource/إكشاف_مثاني> <http://ar.dbpedia.org/property/meshnumber> "12.74"^^<http://dbpedia.org/datatype/nicaraguanCórdoba> .

this will fail:

graphA = Graph()
        graphB = Graph()
        graphA.parse("test/nt/quote-01.nt", format="ntriples")
        graphB.parse("test/nt/quote-02.nt", format="ntriples")
        for subjectA,predicateA,objA in graphA:
            for subjectB,predicateB,objB in graphB:
                self.assertEqual(subjectA, subjectB)
                self.assertEqual(predicateA, predicateB)
                self.assertEqual(objA, objB)