Create subtype of OWLAnnotationAssertionAxiom to handle
values that can be stored in a  byte array string.

Size of Internals for taxon is reduced to
   464,594,112

Size storing references to ByteArrayStringLiteralObject is 521,827,424

Size using literals with java.lang.Strings
  654,548,864   (~version 4.0.1)

 Size for version 4.0.0:
  867,936,432