Created a private branch for the reading of the XYZ 3D molecular structural file.
This is Han Sun's <hasu att nmr dot mpibpc dot mpg dot de> private branch as discussed in the
thread starting at https://mail.gna.org/public/relax-devel/2011-05/msg00004.html (Message-id:
<78889BDF-F6AD-48C7-A8E8-BC3B3D97E5D6@...>).