Copyright for bit-babbler source package in Focal

The bit-babbler package is:

	Copyright (C) 2003 - 2018, Ron Lee 

It is distributed according to the terms of the GNU GPL v2.

On Debian systems, the complete text of the GNU GPL can be found in
/usr/share/common-licenses/GPL-2


The implementation of poz() and pochisq() in include/bit-babbler/chisq.h
are (heavily) based on public domain code from John "Random" Walker's ENT
test suite, which in turn took it with minimal modification from public
domain code by Gary Perlman of the Wang Institute.

The original code for ENT can be found at 
The changes to poz() and pochisq() made in this package are released into
the public domain as well.