[j.868] Use DoubleSpinBox in MaterialEditorDialog (#868) (Closes #868)

GUI/Model/Descriptor/DoubleProperty.h

GUI/Model/Sample/MaterialItem.cpp

GUI/Model/Sample/MaterialModel.cpp

GUI/Model/Sample/MaterialModel.h

GUI/View/Instrument/GISASBeamEditor.cpp

GUI/View/Instrument/PolarizationAnalysisEditor.cpp

GUI/View/Instrument/ScanEditor.cpp

GUI/View/Material/MaterialEditorDialog.cpp

GUI/View/Material/MaterialEditorDialog.h

GUI/View/Material/MaterialTableModel.cpp

GUI/View/Material/MaterialTableModel.h

GUI/View/Numeric/DoubleSpinBox.cpp

GUI/View/Numeric/DoubleSpinBox.h

GUI/View/Numeric/NumWidgetUtil.cpp

GUI/View/Numeric/NumberUtil.cpp

GUI/View/Numeric/NumberUtil.h

GUI/View/Sample/HeinzFormLayout.cpp

GUI/View/Sample/LayerEditorUtil.cpp

GUI/View/Sample/MaterialInplaceForm.cpp