Merge branch 'wmm-andre' into 'master'

corsika/detail/media/GeomagneticModel.inl

corsika/detail/modules/TrackWriter.inl

corsika/framework/core/PhysicalConstants.hpp

corsika/framework/utility/CorsikaData.hpp

corsika/media/ExponentialRefractiveIndex.hpp

corsika/media/GeomagneticModel.hpp

examples/corsika.cpp

examples/vertical_EAS.cpp

tests/media/CMakeLists.txt

tests/media/EmptyGeomagneticData.COF

tests/media/testMagneticField.cpp

tests/stack/testDummyStack.cpp

tests/stack/testHistoryView.cpp