Synopsis
		sflapfill < in.rsf > out.rsf mask=mask.rsf niter=200 grad=n verb=n

Parameters
		bool grad=n [y/n] if y, use gradient instead of laplacian   string mask= optional mask file with zeroes for missing data locations (auxiliary input file name)   int niter=200 number of iterations   bool verb=n [y/n] verbosity flag