Some formatting updates in sixtrack.s90, and resize arrays at nele-2 instead of nele-1.
Some formatting updates in sixtrack.s90, and resize arrays at nele-2 instead of nele-1.

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