Program sfpwcsemb | Semblance from plane-wave construction datacube. 
[SYNOPSIS]
sfpwcsemb < in.rsf > out.rsf nfw= boundary=n verb=n
[PARAMETERS]
bool    | boundary | =n |  [y/n] | 	if y, boundary is data, whereas zero
int     | nfw | = |   | 	calculation window in n1 direction (positive integer)
bool    | verb | =n |  [y/n] | 	verbosity flag 
[DIRECTORY]
user/yliu
