Synopsis
		sfodip2 < in.rsf > out.rsf sin=sn.rsf cos=cs.rsf niter=5 liter=50 rect1=1 rect2=1 a0=0. order=1 verb=y

Parameters
		float a0=0. initial dip   string cos= initial dip (cosine) (auxiliary input file name)   int liter=50 number of linear iterations   int niter=5 number of iterations   int order=1 accuracy order   int rect1=1 dip smoothness on 1st axis   int rect2=1 dip smoothness on 2nd axis   string sin= initial dip (sine) (auxiliary input file name)   bool verb=y [y/n] verbosity flag