Synopsis
		sfwilson < in.rsf > out.rsf lag=lag0.rsf lagout=lag.rsf maxlag= niter=20 eps=1.e-6 n1=maxlag a0=1. verb=y stable=n lagin= filtin=

Parameters
		float a0=1.   float eps=1.e-6 truncation tolerance   string filtin=   string lag= optional input file with filter lags (auxiliary input file name)   string lagin= optional input file with output filter lags   string lagout= auxiliary output file name   int maxlag= maximum lag   int n1=maxlag output filter length   int niter=20 number of iterations   bool stable=n [y/n] stability flag   bool verb=y [y/n] verbosity flag