Fix building beamgas: half and one ended up being defined twice in different common blocks.
Fix building beamgas: half and one ended up being defined twice in different common blocks.

SixTrack/SixTrack,SixTrack/SixTrack,SixTrack/SixTrack,SixTrack/SixTrack,SixTrack/SixTrack,SixTrack/SixTrack