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Routine
psmile_get_halo_indices
(comp_id, grid_id_list, ierror)
Subroutine "PSMILe_get_halo_indices" exchanges halo
points of with neighbour processes. Relevent on source processes only.
Calculates the total number of halos that will be calculated or
exchanged in psmile_get_halo_points.
the halos can be calculated if the grid is mono block and that halos
were given by the user in the actual_shape.
the halos need to be exchanged if the grid is multi block or if no
halos were given by the user in the actual_shape.