A list of available shortcuts relevant to the Grid unit
+ug !! include the Uniform Grid implementation of Grid
+pm3 !! include the Paramesh3 implementation of Grid
+pm2 !! include the Paramesh2 implementation of Grid
+ugio !! include Uniform Grid and the appropriate implementation of IO
+cube64 !! is equivalent to specifying -nxb=64 -nyb=64 -nzb=64
+rnf !! setup with uniform grid, in three dimensions,
!! in non-fixed blocksize mode, with -nxb=8 -nyb=16 -nzb=32