Enhanced accuracy by renormalization in the frequency domain.　

Added WMOPS counter #estimate_itd_wnd_fft_fx,#calc_poc_fx,#find_poc_peak_fx,#estimate_itd_fx,#weighted_ave_fx,#calc_energy_fx,#adapt_gain_fx,#create_M_signal_fx,#stereo_dmx_evs_enc_fx.