[pyramid] add routes /{eid} and /{etype}/{eid} to return RDF when rdf mimetype in Accept HTTP headers * simplify pyramid/resources.py by making the classmethod that returns a closure a simple function and removing the EntityResource and ETYpeResource classes that are barely used * replace predicate MatchIsETypePredicate with MatchIsETypeAndEIDPredicate Team: famarger, schabot, nchauvat, fferry, ethieblin

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raise NotImplementedError("Cannot migrate such an old version. Use intermediate Cubiweb version (try 3.16.x)")