move FileRepository constants out of PODD base namespace 
(except poddBase:hasAlias)
move FileRepository constant hasAlias out of PODD Base namespace
add an invalid alias file for test purposes
add constant for poddFileRepository.owl
updated alias files to match schema in poddFileRepository.owl
add OWL based verification of File Repository alias files
 - add OWLManager as an attribute to FileRepositoryManager
 - add method to verify the alias file using OWLAPI