cubicweb-skos #5404961 [rdfio] Make output class a parameter in rdf_graph_to_entities. [done]

One may need to extend the ExtEntity class in order to have custom behavior. In that respect, the rdf_graph_to_entities() function should be able to yield objects belonging to whatever class subclassing ExtEntity (or more precisely: fullfilling the ExtEntity API). The output class should thus be a parameter of that function.

prioritynormal
typeenhancement
done in<not specified>
load0.500
load left0.000
closed by#b3c339f05792 [rdfio] Make output class a parameter in rdf_graph_to_entities.
patch[rdfio] Make output class a parameter in rdf_graph_to_entities. [applied]