tests/sixtracklib/common: Expand unit-test coverage towards element by element testdata for bbsimple, beambeam and lhc_no_bb
tests/sixtracklib/common: Expand unit-test coverage towards element by element testdata for bbsimple, beambeam and lhc_no_bb

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