Jena and OWLAPI now agree on AtomSubsetAtom for simple cases.
Jena and OWLAPI tests now agree on the definition of an atom.
  - test with SSN ontology/
  - test with all ALC ontologies from TONES (7 in total).
Started removing Gremlin stuff to enable DiagramMetric to pass
  - Sparql and OWLAPI is enough of a maintainance overhead.
Added missing test file