Split dummy argument `e` of `set_contours` into relevant components.
Motivation: make appear clearly input and output.

Split dummy argument `e` of `set_max_speed` into relevant components.
Motivation: make appear clearly input and output.

Replace dummy arguments `s` and `i` of procedure `set_contours` by
dummy argument `e`.

Move the computation of the search window for the outermost contour
and `outside_points` from procedure `set_contours` to main program
unit. The motivation is to have a clearer interface of procedure
`set_contours`, without `s` and `i`.

Rename module `set_all_contours_m` to `set_contours_m` and procedure
`set_all_contours` `set_contours`.

Rename file `set_all_contours.f90` to `set_contours.f90`.

Move the loop on eddies out of `set_all_contours`, up into the main
program unit. The motivation is to be able to easily study a
particular eddy, having access to `cont_list` and corresponding speed
values.

Bug fix: manage absence of a good contour within the outermost
contour.

Create a new figure in function `plot_distr_funct` if ax is None.

`config_nml` should be the same for `test_get_1_outerm` and
`test_set_max_speed`.

Move assignment to `e%max_speed` out of the alternative, to make it
just a little clearer.

Only for program `test_set_max_speed`.

Because we are going to add a preprocessor directive.

We are going to read `cont_list` from the results of
`test_get_1_outerm` so we want the value of `n_max_cont` to be the
same.

We are going to need i for something else.

Remove unused procedures and programs `inside_4`,
`max_speed_contour_ssh`, `test_inside_4`,
`test_max_speed_contour_ssh`. Unused since commit 99e2e1b1.

Complete the SSH sampling between `innermost_level_2` and
`outermost_contour`, and find associated contours in `set_max_speed`.