Merge branch 'ff80' into 'develop'

Base/Vector/RotMatrix.cpp

Base/Vector/RotMatrix.h

Base/Vector/WavevectorInfo.cpp

Base/Vector/WavevectorInfo.h

Core/Export/SampleToPython.cpp

GUI/Model/From/GUISampleBuilder.cpp

GUI/Model/Sample/ItemWithParticles.cpp

GUI/Model/Sample/ItemWithParticles.h

GUI/Model/Trafo/RotationItems.cpp

GUI/Model/Trafo/RotationItems.h

Sample/Lattice/Lattice3D.cpp

Sample/Lattice/Lattice3D.h

Sample/Material/BaseMaterialImpl.h

Sample/Material/MagneticMaterialImpl.cpp

Sample/Material/MagneticMaterialImpl.h

Sample/Material/Material.cpp

Sample/Material/Material.h

Sample/Particle/Crystal.cpp

Sample/Particle/Crystal.h

Sample/Particle/MesoCrystal.cpp