Merge branch 'SmallFixes' into 'master'

Applications/DataExplorer/DataView/LinearEditDialog.cpp

Applications/DataExplorer/VtkVis/VtkPointsSource.cpp

Applications/DataExplorer/VtkVis/VtkPolylinesSource.cpp

Applications/DataExplorer/VtkVis/VtkStationSource.cpp

Applications/FileIO/Gmsh/GMSHPolygonTree.cpp

Applications/FileIO/Gmsh/GMSHPolygonTree.h

Applications/FileIO/Legacy/OGSIOVer4.cpp

Applications/Utils/MeshGeoTools/VerticalSliceFromLayers.cpp

GeoLib/Polygon.cpp

GeoLib/Polygon.h

MaterialLib/MPL/VariableType.cpp

ProcessLib/HeatTransportBHE/HeatTransportBHEProcess.cpp

Tests/xdmfdiff/xdmfdiff.cpp