new directory GUI/Model/Descriptor; rm directory GUI/Model/Group

GUI/Model/BaseItem/GroupItemController.h

GUI/Model/Descriptor/AxisProperty.cpp

GUI/Model/Descriptor/AxisProperty.h

GUI/Model/Descriptor/DoubleDescriptor.cpp

GUI/Model/Descriptor/DoubleDescriptor.h

GUI/Model/Descriptor/DoubleProperty.cpp

GUI/Model/Descriptor/DoubleProperty.h

GUI/Model/Descriptor/SelectionDescriptor.h

GUI/Model/Descriptor/SelectionProperty.h

GUI/Model/Descriptor/UIntDescriptor.cpp

GUI/Model/Descriptor/UIntDescriptor.h

GUI/Model/Descriptor/UIntProperty.cpp

GUI/Model/Descriptor/UIntProperty.h

GUI/Model/Descriptor/VectorDescriptor.h

GUI/Model/Descriptor/VectorProperty.cpp

GUI/Model/Descriptor/VectorProperty.h

GUI/Model/Item/AxesItems.h

GUI/Model/Item/BackgroundItems.cpp

GUI/Model/Item/BackgroundItems.h

GUI/Model/Item/BeamDistributionItem.cpp