Merge branch 'better_docs' into 'master'

corsika/detail/framework/core/ParticleProperties.inl

corsika/detail/framework/process/InteractionProcess.hpp

corsika/detail/media/LinearApproximationIntegrator.inl

corsika/detail/media/UniformRefractiveIndex.inl

corsika/framework/core/Cascade.hpp

corsika/framework/core/Logging.hpp

corsika/framework/core/ParticleProperties.hpp

corsika/framework/geometry/LeapFrogTrajectory.hpp

corsika/framework/process/BaseProcess.hpp

corsika/framework/process/NullModel.hpp

corsika/framework/process/ProcessSequence.hpp

corsika/framework/process/ProcessTraits.hpp

corsika/framework/process/StackProcess.hpp

corsika/framework/process/SwitchProcessSequence.hpp

corsika/framework/random/ExponentialDistribution.hpp

corsika/framework/random/UniformRealDistribution.hpp

corsika/framework/stack/StackIteratorInterface.hpp

corsika/media/BaseExponential.hpp

corsika/media/HomogeneousMedium.hpp

corsika/media/InhomogeneousMedium.hpp