Added more text to describe the consistency testing approach.
Also includes a very basic point by point protocol for consistency testing.
This was proposed by by Edward d'Auvergne at:
https://mail.gna.org/public/relax-devel/2012-09/msg00028.html
(Message-id: <CAED9pY_YTDj8SX8crQu9on4LqA=pLzQwwyaz9kMLWD96xg-d0g@...>)
This also follows a discussion started by Edward d'Auvergne at:
https://mail.gna.org/public/relax-devel/2012-09/msg00019.html
(Message-id: <CAED9pY8XhmmvyfBS7mZA8XZ=4mJZe9TuGjARHoV2tVcjjV9SrQ@...>)
