Implement Max's comments during code review

corsika/detail/framework/geometry/FourVector.inl

corsika/detail/modules/TimeCut.inl

corsika/detail/modules/radio/RadioProcess.inl

corsika/detail/modules/radio/ZHS.inl

corsika/detail/modules/radio/detectors/RadioDetector.inl

corsika/detail/modules/radio/propagators/RadioPropagator.inl

corsika/detail/modules/radio/propagators/SignalPath.inl

...ika/detail/modules/radio/propagators/SimplePropagator.inl

...a/detail/modules/radio/propagators/StraightPropagator.inl

corsika/framework/core/PhysicalUnits.hpp

corsika/modules/TimeCut.hpp

corsika/modules/radio/CoREAS.hpp

corsika/modules/radio/RadioProcess.hpp

corsika/modules/radio/ZHS.hpp

corsika/modules/radio/detectors/RadioDetector.hpp

corsika/modules/radio/propagators/RadioPropagator.hpp

corsika/modules/radio/propagators/SignalPath.hpp

corsika/modules/radio/propagators/SimplePropagator.hpp

corsika/modules/radio/propagators/StraightPropagator.hpp