Merge remote-tracking branch 'ufz/master' into pr_petsc_solver

FileIO/ImportFileTypes.h

FileIO/RapidXmlIO/RapidVtuInterface.cpp

FileIO/RapidXmlIO/RapidVtuInterface.h

FileIO/TetGenInterface.cpp

FileIO/TetGenInterface.h

GeoLib/Grid.h

GeoLib/Polyline.cpp

GeoLib/Polyline.h

GeoLib/Surface.cpp

GeoLib/Surface.h

Gui/DataView/MeshLayerEditDialog.cpp

Gui/DataView/MeshLayerEditDialog.h

Gui/DataView/MshView.cpp

Gui/DataView/MshView.h

Gui/VtkVis/VtkCompositeColorByHeightFilter.cpp

Gui/mainwindow.cpp

MathLib/LinearFunction.h

MeshGeoToolsLib/MeshNodeSearcher.cpp

MeshGeoToolsLib/MeshNodesAlongPolyline.cpp

MeshGeoToolsLib/MeshNodesAlongPolyline.h