Program sfexpd | Expand 2D data corret version with true spatial cooridinates  
[SYNOPSIS]
sfexpd > out.rsf < in.rsf left=0.5*nx right=0.5*nx top=0 bottom=0
[PARAMETERS]
int     | bottom | =0 |   | 	
int     | left | =0.5*nx |   | 	
int     | right | =0.5*nx |   | 	
int     | top | =0 |   | 	
[DIRECTORY]
user/chenyk
