Program sfffttest | Test 3-D Fourier transform. 
[SYNOPSIS]
sfffttest < freq.rsf > space.rsf inv=n n1= n2= n3= cmplx=n pad1=1
[PARAMETERS]
bool    | cmplx | =n |  [y/n] | 	use complex FFT 
bool    | inv | =n |  [y/n] | 	inverse flag 
int     | n1 | = |   | 	
int     | n2 | = |   | 	
int     | n3 | = |   | 	
int     | pad1 | =1 |   | 	padding factor on the first axis 
[DIRECTORY]
user/fomels
