Mesh Interface
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The *pop* model can be interfaced to the retinal mesh model.
This describes the functions that are called from *mod_pop_util*.

To prepare, and receive information

 - mod_mesh_rgc_01_prep() - Prepare the retina mesh model
 - mod_mesh_get_mm_mosaic_cn() - get number of cones in mosaic
 - mod_mesh_ptr_mm_mosaic_cx() - get pointer to list of cone x-coords
 - mod_mesh_ptr_mm_mosaic_cy() - get pointer to list of cone y-coords
 - mod_mesh_ptr_mm_mosaic_cid() - get ptr. to cone ID: 0,1,2 (S,M,L)
 - mod_mesh_ptr_mm_mosaic_dens_deg() - get cone density, per deg^2.
 - mod_mesh_ptr_mm_mosaic_degpmm() - get deg/mm on retina.


On each trial, to get responses

 - mod_mesh_compute_diff_all() - Run mesh model on stimulus,
   compute P-H difference at all loci
 - mod_mesh_get_spikes_2d_flag() - Return spikes for each unit that
   is flagged in the indicator array