Real data for fit is finally taken from RealDataModel

GUI/coregui/Models/ApplicationModels.cpp

GUI/coregui/Models/DomainFittingBuilder.cpp

GUI/coregui/Models/DomainFittingBuilder.h

GUI/coregui/Models/JobItem.cpp

GUI/coregui/Models/JobModel.cpp

GUI/coregui/Models/JobModel.h

GUI/coregui/Models/RealDataItem.cpp

GUI/coregui/Models/RealDataItem.h

GUI/coregui/Views/FitWidgets/FitSuiteWidget.cpp

GUI/coregui/Views/ImportDataWidgets/ImportDataAssistant.cpp

.../Views/SimulationWidgets/SimulationDataSelectorWidget.cpp

...coregui/Views/SimulationWidgets/SimulationSetupWidget.cpp