Synopsis
		sfcr < row_in.rsf col_in=col_in.rsf > row_out.rsf col_out=col_out.rsf niter=10 tol=0.0f prec=y

Parameters
		file col_in= auxiliary input file name   file col_out= auxiliary output file name   int niter=10 number of iterations   bool prec=y [y/n] If apply preconditioning   float tol=0.0f CG tolerance