Add method getVirtuosoRepository in RDFDataUnitHelper in frontend
- need for cleaning applications graphs
- issue #598
Change method deleteApplicationGraphs to String in RDFDataUnit interface
- returns message about graphs removing
- issue #598
Change implementation of method deleteApplicationGraphs in BaseRDFRepo
- returns message about graphs removing
- issue #598
Add removing application graphs after click on clearButton in Settings
- show notification about graph deleting
- issue #598