provide and use XML::writeTaggedValue

GUI/Model/Axis/AmplitudeAxisItem.cpp

GUI/Model/Axis/BasicAxisItem.cpp

GUI/Model/Beam/DistributionItems.cpp

GUI/Model/Beam/GrazingScanItem.cpp

GUI/Model/Beam/SourceItems.cpp

GUI/Model/Data/Data1DItem.cpp

GUI/Model/Data/Data2DItem.cpp

GUI/Model/Data/DataItem.cpp

GUI/Model/Descriptor/AxisProperty.cpp

GUI/Model/Detector/DetectorItem.cpp

GUI/Model/File/DatafileItem.cpp

GUI/Model/File/DatafilesSet.cpp

GUI/Model/Job/BatchInfo.cpp

GUI/Model/Job/JobItem.cpp

GUI/Model/Job/JobsSet.cpp

GUI/Model/Mask/MaskItems.cpp

GUI/Model/Material/MaterialItem.cpp

GUI/Model/Mini/MinimizerItems.cpp

GUI/Model/Par/ParameterBackup.cpp

GUI/Model/Par/ParameterTreeItems.cpp