python/sixtracklib: adds minimal implementation for NS(RFMultiPole) to python SixTrackLib
python/sixtracklib: adds minimal implementation for NS(RFMultiPole) to python SixTrackLib

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