Add method get/setDataGraph to RDFReposioty interface, change graph from Resource to URI,
change RDFFormat to RDFFormatType in method loadRDfromRepositoryToFile.
Change method setDafaultGraph to setDataGraph defined in RDFDataRepository interface.
Update LocalRDFRepoTest using RDFFormatType in call method loadRDFfromRepositoryToFile.
Add implementation and using of get/setDataGraph.
Add TRIX,NT(N_TRIPLES) as next possible RDF types to RDFFormatType.
Update method mapData in FileLoaderDialog - using add RDFTypes.
Update FileLoader - change RDFFormat to RDFFormatType in method load,
add method for dataset - prepare for browse/quering over concrete graph
- prepare for issue #110
Using MyRDFHandler as handler for loading data - issue #112.
Add MyRDFHandler class for better writing RDF data to File.
Update implementation of loadRDFfromRepositoryToFile using RDFormatType,
change graph representation from Resource to URI,
Update methods for select/construct using concrete graph.