Synopsis
		sfnonloc < inp.rsf > out.rsf ns= bx= gauss=n repeat=1 ax=

Tomasi, C., and R. Manduchi, 1998, Bilateral filtering
for gray and color images: Proceedings of the 1998
IEEE International Conference on Computer Vision,
IEEE, 836-846

Parameters
		float ax= Gaussian weight for the range distance   float bx= exponential weight for the domain distance (different if gaussian)   bool gauss=n [y/n] if y, Gaussian weight, whereas Triangle weight   int ns= spray radius   int repeat=1 repeat filtering several times