Synopsis
		sfafac < Fa.rsf > Ff.rsf lag=Fl.rsf ompchunk=1 verb=n stable=n niter=20 nn=1000 nf=32

Parameters
		string lag= auxiliary output file name   int nf=32 factor coefficients   int niter=20 Wilson iterations   int nn=1000 Helix diameter   int ompchunk=1 OMP chunk size   bool stable=n [y/n] stability flag   bool verb=n [y/n] verbosity flag