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`.

Because we are going to use it also for another shapefile than extremum.

It seems simpler than putting it in `$large_input_dir`. I do not see a
drawback.

Use component with type extremum in derived type eddy, instead of
components `coord_extr` and `ssh_extr`. Component `coord_proj` of
derived type extremum also replaces component `ind_extr` of derived
type snapshot.

For easier comparison of runs.

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`.

`${my_target}` is not defined here.

Rename program `test_write_eddy` to `test_write_null`. Following the
change of name of the file.

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`.

The program `test_weight` no longer exists, since commit 9ff8a9bb.

This bug comes from commit cd8df9d2.

Following update of NetCDF95.

Introducing `config_graph_nml`.

Following commit 3289c070.

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