Add meanPTmassiveParticle.py: calculate mean pt of massive partcile.
collect mean pt for massless particles inside freeze-out surface.
change resonance decay eta table to range (-0.3,0.3) gaussian table,
kind=1.
iInteSp: calculate total charged particle dN for pt range (0.15,10),
eta (-3,3) to ref LHC mean pt calculation.