improve the spin analysis script
improve the spin analysis script

include the calcualtion of Fourier coefficient f_n for P^x, P^y, and P^z

chunshen1987/hadronic_afterburner_toolkit,chunshen1987/hadronic_afterburner_toolkit,chunshen1987/hadronic_afterburner_toolkit,chunshen1987/hadronic_afterburner_toolkit