Merge branch 'rprechelt-us-standard' into 'master'

corsika/detail/media/BaseExponential.inl

corsika/detail/media/CORSIKA7Atmospheres.inl

corsika/detail/media/FlatExponential.inl

corsika/detail/media/LayeredSphericalAtmosphereBuilder.inl

corsika/detail/media/SlidingPlanarExponential.inl

corsika/detail/modules/sibyll/Interaction.inl

corsika/detail/modules/sibyll/NuclearInteraction.inl

corsika/framework/utility/ImplementsMixin.hpp

corsika/media/BaseExponential.hpp

corsika/media/CORSIKA7Atmospheres.hpp

corsika/media/Environment.hpp

corsika/media/FlatExponential.hpp

corsika/media/LayeredSphericalAtmosphereBuilder.hpp

corsika/media/SlidingPlanarExponential.hpp

documentation/Doxyfile.in

examples/corsika.cpp

examples/em_shower.cpp

examples/hybrid_MC.cpp

examples/mars.cpp

examples/vertical_EAS.cpp