* [DH_TEST,SC] Renamed dh_test/2 -> dh_test_agent/2, allowing test predicates for populations to be added in the future.
* [DH_TEST,EXT] Allow file(File) as input to dh_test_agent/2 (besides graph(Graph) and rdf(S,P,O)).
Merge branch 'master' of https://github.com/wouterbeek/DataHives