[cm] Better DataExplorer includes 1/2.

Applications/DataExplorer/Base/OGSError.cpp

Applications/DataExplorer/Base/TreeItem.cpp

Applications/DataExplorer/Base/TreeModel.cpp

Applications/DataExplorer/Base/TreeModelIterator.cpp

Applications/DataExplorer/DataView/AddLayerToMeshDialog.cpp

Applications/DataExplorer/DataView/BaseItem.h

Applications/DataExplorer/DataView/CMakeLists.txt

Applications/DataExplorer/DataView/CondFromRasterDialog.cpp

Applications/DataExplorer/DataView/CondItem.h

...ions/DataExplorer/DataView/CreateStructuredGridDialog.cpp

...ions/DataExplorer/DataView/DataExplorerSettingsDialog.cpp

...ications/DataExplorer/DataView/DiagramView/CMakeLists.txt

...cations/DataExplorer/DataView/DiagramView/DiagramList.cpp

.../DataExplorer/DataView/DiagramView/DiagramPrefsDialog.cpp

...ications/DataExplorer/DataView/DiagramView/DiagramScene.h

...ations/DataExplorer/DataView/DirectConditionGenerator.cpp

Applications/DataExplorer/DataView/ElementTreeModel.cpp

Applications/DataExplorer/DataView/ElementTreeModel.h

Applications/DataExplorer/DataView/ElementTreeView.cpp

Applications/DataExplorer/DataView/FemConditionModel.cpp