Synopsis
		sfkron < in.rsf > out.rsf mat1=mat1.rsf mat2=mat2.rsf adj=n inv=n niter=100 eps=0. nliter=1

Parameters
		bool adj=n [y/n] adjoint flag   float eps=0. regularization   bool inv=n [y/n] inversion flag   file mat1= auxiliary input file name   file mat2= auxiliary input file name   int niter=100 maximum number of iterations   int nliter=1 number of nonlinear iterations