Add support for distinct labels on different parts of the reification pattern.

[NicolasRouquette]

Define OML "built-in" annotation vocabulary to support labeling different elements of the OML reified entity relationship patern:

1. oml:hasReificationLabel corresponds to rdfs:label on the OWL Class corresponding to the reification
2. oml:hasPropertyLabel corresponds to rdfs:label on the OWL ObjectProperty corresponding to the reified property.
3. oml:hasInverseLabel corresponds to rdfs:Label on the OWL ObjectProperty corresponding to the inverse reified property, if defined.

Note that there is no reification per se for OML DataRelationshipToStructure

[NicolasRouquette]

The only "built-in" aspect about these 5 annotation properties pertains to the OMF/OWL2API; not to OML per se.

[NicolasRouquette]

See JPL-IMCE/gov.nasa.jpl.imce.ontologies.public#64
See JPL-IMCE/gov.nasa.jpl.omf.scala.binding.owlapi#58

[NicolasRouquette]

Implemented in the ontologies and the OMF/OWLAPI binding.