Thorn CartGrid3D
Authors    : Gabrielle Allen, Gerd Lanfermann, Joan Masso
CVS info   : $Header$
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1. Purpose of the thorn

This thorn sets up a Cartesian grid, for a given domain. It also
provides a method for registering symmetries of Grid Functions
across the grid axes, and a call for applying symmetry boundary
conditions.

2. Additional information

This thorn currently only works in 3D