We import in the test infrastructure the experiment `Inst_eddies_4`
because we want to no longer keep invalid contours, so we will need to
update the experiment.

Only define and print `n_radius4` and `n_missing_speed` if `with_radius_4`.

We cannot test `"radius4" in shape_rec_outer.record`, as
`shape_rec_outer.record` is not a dictionary. We could test `"radius4"
in shape_rec_outer.record.as_dict()` but it is better to test outside
of the loop in the field names of the shapefile reader object. The bug
comes from commit 83a61016.

As `grid_lon_lat` may be false, we define `e%extr%coord_proj`.

I do not see why this was not done in commit 24b5b079.

This shortens the file `test_get_1_outerm.f90`.

We will need this new shapefile in program `eddy_graph` only for a non
longitude-latitude grid. We add a new dummy argument `grid_lon_lat` to
procedure `shpc_create` to decide whether we create the shapefile
`extr_proj`.

Add component `innermost_level` to derived type eddy. So
`innermost_level` does not transit as an argument through main program
unit `inst_eddies` any longer.

Extract definition of extrema from procedure `set_all_outerm` into new
procedure `set_all_extr`. So we are reverting part of commit
f5f4298d. The drawback, for now, is that `innermost_level` has to
transit in the main program unit from `set_all_extr` to
`set_all_outerm`.

Rename dummy argument `innermost_level` to `innermost_level_2`.

Because we want to split `set_all_outerm` into `set_all_extr` and
`set_all_contours`. `innermost_level` will become an `intent(in)`
argument of `set_all_contours`.

Rename file `test_write_eddy.f90` to `test_write_null.f90`. The name
was badly chosen because the program is not a unit test of procedure
`write_eddy`. In fact, it does not even call `write_eddy`.

Use relative path to Overlap from `Inst_eddies/Tests`. For symmetry
with what we do in `Overlap/Tests`. So now the directories Overlap and
`Inst_eddies` can be added from the top-level `CMakeLists.txt` in
either order.

Add executable in the directoy containing the main program unit. This
is clearer as the executable file will be created in the corresponding
binary directory. Since the directory Overlap is added after
`Inst_eddies`, targets defined in `Overlap/Tests` are not yet defined
when processing `Inst_eddies`, so we cannot use `target_sources` for
these targets in `Inst_eddies`. So we use a relative path to
`Inst_eddies` from `Overlap/Tests`.

This bug comes from commit cd8df9d2.

Following update of NetCDF95.

Update `CMakeLists.txt` files for `test_get_dispatch_snap`.

Update `CMakeLists.txt` files to take into account commit 3289c070.