Program sfstft | Short-time Fourier transform (STFT). 
[SYNOPSIS]
sfstft < in.rsf > out.rsf inv=n window=n sym=n opt=y ntw=7
[PARAMETERS]
bool    | inv | =n |  [y/n] | 	if y, perform inverse transform 
int     | ntw | =7 |   | 	time-window length 
bool    | opt | =y |  [y/n] | 	if y, determine optimal size for efficiency 
bool    | sym | =n |  [y/n] | 	if y, apply symmetric scaling to make the FFT operator Hermitian 
bool    | window | =n |  [y/n] | 	if y, add Hanning window
[DIRECTORY]
user/yliu
