11.1.9 grid_set_symmetry: use symmetry in grid

      subroutine grid_get_symmetry (record,use_sym)
      subroutine grid_set_symmetry (record,use_sym)
      implicit double precision (a-h,o-z)
      logical use_sym

If use_sym is true, then point group symmetry will be exploited by eliminating symmetry-equivalent points, and transferring their weight to the single symmetry-unique point.