Submitted by Daniel S. Karls (karl0100 |AT| umn DOT edu), University of Minnesota.

This Test Driver computes the total potential energy and forces acting on a
finite cluster of atoms in a rectangular box, supplied in the form of an xyz
file which lies in each of its Tests' directories.  It then relaxes this config-
uration using the Polak-Ribiere version of conjugate gradient minimization (see
LAMMPS 'minimize' documentation for more details).

The xyz file specifying the initial structure must be of the following form:

Natoms
Lattice=" Ax Ay Az Bx By Bz Cx Cy Cz "
Element positionx positiony positionz
Element positionx positiony positionz
.
.
.
where A, B, and C are the simulation box edge vectors (fixed boundary
conditions), and Element is an integer which specifies the atomic species code
used by LAMMPS.  The numbering of these species codes should start from 1 and
corresponds to the chemical species according to the order of elements
specified in pipeline.stdin.tpl:  the first species given in pipeline.stdin.tpl
should correspond to species 1, the second to species 2, etc (and note that
multiple species are separated by spaces).

Note: Although the Tests constructed from this Test Driver can be assembled
using `testgenie`, the actual xyz data files for each of the Tests are
contained in xyz_input_files.txz.