Updated OAQATypes.xml to version 2.4 #12
* Added super types from NEAL project: Concept and ConceptMention.
* Added Entity type, inherited from Concept.
* Added RelationMention, inherited from ConceptMention.
* NamedEntity is now renamed to EntityMention, and inherited from
ConceptMention. Moved ids field to Concept.
* Triple type is generalized and renamed to Relation. Subject, object,
and other fields are replaced with arguments field.
* TripleStore search result is updated to RelationBaseSearchResult,
which is now based on Relation instead of Triple.
* PassageFromTriple is updated to PassageFromRelation.
* Field namedEntities is removed from Parse type.
* Added new container type Interpretation to integrate Concepts and
ConceptMentions.
* Predicate type now renamed to Token.