Committing intermediate progress before tearing it all up. I have
migrated to Turtle for defining the ontology instead of RDF/XML. The
latter is just too difficult to use in my opinion. I converted the
ontology from the RDF/XML file using EasyRDF. I removed some previously
committed test files and moved other test files into the test directory.
I added a data constants class that can be used for constants commonly
required throughout the code.

Signed-off-by: Jay Jay Billings <billingsjj@ornl.gov>