sixtracklib/cuda: updates call API to CudaTrackJob constuctors
sixtracklib/cuda: updates call API to CudaTrackJob constuctors

The SIXTRL_OPTIONAL decorating attribute is removed since the
doInitCudaTrackJob method has a corresponding parameter -> the
currently not used degree of freedom can be handled more cleanly there

SixTrack/SixTrackLib,SixTrack/SixTrackLib,SixTrack/SixTrackLib,SixTrack/SixTrackLib