Synopsis
		sfintbin < in.rsf > out.rsf inv=n xkey= ykey= xmin= xmax= ymin= ymax= head= xk= yk= map= mask=

If inv=n, the input is 2-D (n1 x ntr). The output is 3-D (n1 x n2 x n3), n2 and
n3 correspond to two selected keys from the header file.

If inv=y, the input is 3-D, and the output is 2-D.

if xkey < 0, the first axis indexes traces in a gather like cdpt.

June 2015 program of the month:
http://ahay.org/blog/2015/06/10/program-of-the-month-sfintbin/

Parameters
		string head= header file   bool inv=n [y/n] inversion flag   string map= output map file   string mask= output mask file   string xk= x key name   int xkey= x key number (if no xk), default is fldr   int xmax= x maximum   int xmin= x minimum   string yk= y key name   int ykey= y key number (if no yk), default is tracf   int ymax= y maximum   int ymin= y minimum