Synopsis
		sfkarmans < in.rsf > out.rsf prm=prm.rsf niter=100 x10=6. x20=-0.5 x30=200. verb=n

Parameters
		int niter=100 number of iterations   file prm= auxiliary output file name   bool verb=n [y/n] verbosity flag   float x10=6. initial nonlinear parameter x1 value   float x20=-0.5 initial nonlinear parameter x2 value   float x30=200. initial nonlinear parameter x3 value