option to include equivalent classes with subclass query

[balhoff]

No description provided.

[balhoff]

Also, explore using property paths like this:

rdfs:subClassOf --> direct superclasses
rdfs:subClassOf? --> direct superclasses including self
rdfs:subClassOf+ --> all superclasses
rdfs:subClassOf* --> all superclasses including self

[balhoff]

Instead of handling those property paths as suggested, the current plan is to include all logical superclasses for rdfs:subClassOf. If equivalent classes are also desired the alternative path operator can be used as in:
? rdfs:subClassOf|owl:equivalentClass "expression"

This currently works in the SPARQL query answering mode, but not yet in the query expansion to FILTER mode.

[balhoff]

Instead of these options, retained current behavior and added availability of sesame:directSubClassOf and sesame:directType in #123.