Introduced the count_spins() function into the consitency tests code.
This change is part of the shifting to the new design.
I was explained in a post by Edward d'Auvergne at:
https://mail.gna.org/public/relax-devel/2008-01/msg00041.html (Message-id:
<7f080ed10801111043g7954a49fic72f433110d4cfbc@...>)