Return a Grid with the same number of orbitals along each dimension

with the specified Wigner-Seitz radius.

dimension (int): The number of spatial dimensions. grid_length (int): The number of orbitals along each dimension. wigner_seitz_radius (float): The Wigner-Seitz radius per particle, in Bohr. filling_fraction (float): The average spin-orbital occupation. Specifies the number of particles (rounding down). spinless (boolean): Whether to give the system without or with spin.