Copyright for mtx source package in Xenial

This package was debianized by Bdale Garbee bdale@gag.com on
Sun, 10 Aug 1997 03:05:18 -0600.

mtx was downloaded from http://mtx.sourceforge.net/

Copyright:

  Copyright 1997, 1998 Leonard Zubkoff 
  Changes copyright 2000, 2001 Eric Green 
  Changes copyright 2007-2008 by Robert Nelson 

  GPL, version 2

On Debian GNU/Linux systems, the complete text of the GNU General
Public License can be found in `/usr/share/common-licenses/GPL-2'.