GUI/Model collect things in directories Model and Item

GUI/Model/Fit/FitParameterHelper.cpp

GUI/Model/Group/SelectionDescriptor.h

GUI/Model/Instrument/InstrumentLibrary.cpp

GUI/Model/Instrument/InstrumentLibrary.h

GUI/Model/Item/AxesItems.cpp

GUI/Model/Item/AxesItems.h

GUI/Model/Item/BackgroundItems.cpp

GUI/Model/Item/BackgroundItems.h

GUI/Model/Item/BeamAngleItems.cpp

GUI/Model/Item/BeamAngleItems.h

GUI/Model/Item/BeamDistributionItem.cpp

GUI/Model/Item/BeamDistributionItem.h

GUI/Model/Item/BeamItems.cpp

GUI/Model/Item/BeamItems.h

GUI/Model/Item/BeamWavelengthItem.cpp

GUI/Model/Item/BeamWavelengthItem.h

GUI/Model/Item/Data1DViewItem.cpp

GUI/Model/Item/Data1DViewItem.h

GUI/Model/Item/DataItem.cpp

GUI/Model/Item/DataItem.h