add test manifest for incorrect format
change current version to poddB/2
make testSchemaManager a protected field
test uploadSchemaOntologiesInorder()
some code cleanup
add new copy of c2.owl to be consistent with schema-manifest-a1b2c2.ttl
rename API methods
 - PoddSesameManager.getAllSchemaOntologyVersions() to
getAllCurrentSchemaOntologyVersions(), and
 - PoddSchemaManager.getSchemaOntologies() to
getCurrentSchemaOntologies()
add API methods to retrieve all Schema Ontology versions in PODD
use getSchemaOntologies() to verify total no. of schemas in PODD
check consistency of schema-manifest specified imports with the actual
imports specified in the ontology
Merge remote-tracking branch 'origin/master' into explanations
experimentally use HermiT instead of Pellet