Get all neighbors to a site within a sphere of radius r.  Excludes the
        site itself.

        Args:
            site (Site): Which is the center of the sphere.
            r (float): Radius of sphere.
            include_index (bool): Whether the non-supercell site index
                is included in the returned data
            include_image (bool): Whether to include the supercell image
                is included in the returned data

        Returns:
            [(site, dist) ...] since most of the time, subsequent processing
            requires the distance.
            If include_index == True, the tuple for each neighbor also includes
            the index of the neighbor.
            If include_supercell == True, the tuple for each neighbor also includes
            the index of supercell.

def get_neighbors(self, site, r, include_index=False, include_image=False):
        """
        Get all neighbors to a site within a sphere of radius r.  Excludes the
        site itself.

        Args:
            site (Site): Which is the center of the sphere.
            r (float): Radius of sphere.
            include_index (bool): Whether the non-supercell site index
                is included in the returned data
            include_image (bool): Whether to include the supercell image
                is included in the returned data

        Returns:
            [(site, dist) ...] since most of the time, subsequent processing
            requires the distance.
            If include_index == True, the tuple for each neighbor also includes
            the index of the neighbor.
            If include_supercell == True, the tuple for each neighbor also includes
            the index of supercell.
        """
        nn = self.get_sites_in_sphere(site.coords, r,
                                      include_index=include_index,
                                      include_image=include_image)
        return [d for d in nn if site != d[0]]