Program sfhconv | Convolution of two helix filters. 
[SYNOPSIS]
sfhconv < inp.rsf other=oth.rsf > out.rsf one=y lag=
[PARAMETERS]
string  | lag | = |   | 	
bool    | one | =y |  [y/n] | 	include leading one 
file    | other | = |   | 	auxiliary input file name
[DIRECTORY]
user/gee
