Implemented a system test to catch a bug in the use of volumes for relaxation curve-fitting.
This bug was identified by Maddy Strickland <M.Strickland att bristol dott ac dot uk> in the post
Message-id: <55870.137.222.43.71.1294412799.squirrel@...>
https://mail.gna.org/public/relax-users/2011-01/msg00007.html.
