useless constructor removed
fixed dbmetadata! matcher
Added new method getAttributeKey to DataDefinition which always returns
the key, which can be used to call getAttribute and setAttribute. Marked
getAttributePosition as deprecated
correct cast in postgres. Linear recursive query works!
Merge branch 'bugfix/getAttributePosition' into feature/swrlDatalog

Conflicts:
	quest-sparql-compliance/src/main/resources/testcases-dawg-quest/data-r2/manifest-evaluation.ttl
linear recursion works