Changes related to rdf split
Merge origin/rdf-split into rdf-split

Conflicts:
	dataunit-rdf-impl/src/main/java/cz/cuni/mff/xrg/odcs/rdf/interfaces/ManagableRdfDataUnit.java
	dataunit-rdf/src/main/java/cz/cuni/mff/xrg/odcs/rdf/interfaces/RDFDataUnit.java
Merge origin/rdf-split into rdf-split
Merge origin/rdf-split into rdf-split

Conflicts:
	dataunit-rdf-impl/src/main/java/cz/cuni/mff/xrg/odcs/rdf/interfaces/ManagableRdfDataUnit.java
	dataunit-rdf/src/main/java/cz/cuni/mff/xrg/odcs/rdf/interfaces/RDFDataUnit.java