Added flag to distinguish true and false positives

— Changed the relation between a MySynset object and a SemanticType
object so it will accept a attribute on the N-N table generated by
Hibernate.
— To enable the new form of N-N relationship it was necessary to add
MySynsetSemtype and MySynsetSemtypeID objects.
— Mapper classes had to be altered so they would call the new method
responsible for inserting a SemanticType as a relation on a MySynset
object.