Program sfcurvature | Curvature 
[SYNOPSIS]
sfcurvature < hor.rsf > cur.rsf rotation=n scale=1.0 vscale=1.0 what=
[PARAMETERS]
bool    | rotation | =n |  [y/n] | 	if y: rotation, if n: convergence 
float   | scale | =1.0 |   | 	scaling (from time to depth) 
float   | vscale | =1.0 |   | 	scaling (from time to depth) 
string  | what | = |   | 	what to compute 
[DIRECTORY]
user/parvaneh
