Synopsis
		sfblur < in.rsf > out.rsf adj=n inv=n spk=y niter=100 eps=1. rect= rect2=1.0 repeat=1 ncycle=1 perc=50.0 fact=0.5

Parameters
		bool adj=n [y/n] adjoint flag   float eps=1. scaling   float fact=0.5 factor for sharpening   bool inv=n [y/n] inversion flag   int ncycle=1 number of nonlinear cycles   int niter=100 maximum number of iterations   float perc=50.0 percentage for sharpening   int rect= blurring radius   float rect2=1.0 smoothing radius   int repeat=1 repeat smoothing   bool spk=y [y/n] spiky inversion