`MAX_RADIUS_deg` is not general enough for a non longitude latitude
grid. The variable `max_radius` moves from module `input_ssh_m` to
module `config_m`. The variable `MAX_RADIUS_deg` disappears. The
constraint `2 * max_radius_deg(1) < 180` becomes `4 * max_radius(1) <
nlon` but is only applied to the periodic case because we do not have
the general equivalent of 180° in number of points.

In procedure `get_var`.

Promote nlon and nlat to variables of module `input_ssh_m`, avoiding
their repeated computation.

Preparing to allow access to variables of module `input_ssh_m`.

Not worth it for a single point.

Rename variable `outside_points_proj` to `outside_points`.

`Region_1_20454_cyclone_3/config_nml.txt` is a symlink to
`Extraction_eddies_region_1_noise/config_nml.txt`.

In main program units `inst_eddies`, `examine_eddy` and
`test_get_1_outerm`, redefine `outside_points` as coordinates in
projection space, avoiding a round trip to longitude and latitude. In
`examine_eddy`, we therefore store `coord_proj` instead of coord.

From `nearby_extr`.

Instead of `outside_points`.

Instead of `outside_points`.

Avoiding conversion back and forth to real.

Instead of corner.

Instead of corner.

Redefine `corner_window` as coordinates in projection space, avoiding
a conversion back and forth to longitude and latitude.

Instead of corner.

Using the fact that `(corner_whole - corner) / step` is mathematically
an integer.

Instead of from `out_cont`.

After reading `cont_list_proj`.

Pass `corner_proj` instead of corner to `mean_speed`, avoiding a
repeated computation.

Avoiding a repeated computation.

Pass `extr%coord_proj` instead of `extr%coord` to `get_1_outerm`,
avoiding a repeated computation of `extr%coord_proj`.

Rename `coord_extr` to `extr_coord` and `coord_extr_proj` to
`extr_coord_proj`, to have the same names as in procedure
`set_max_speed`.

Following update 614b427 of `Contour_531`.

Call `input_ssh` from main program `test_mean_speed`. This is
necessary because procedure `mean_speed` uses variable corner from
module `input_ssh_m`. Note that we have to call config before
`input_ssh` since `input_ssh` uses a variable from module `config_m`.

Preparing for replacement by call to `input_ssh`.