Remove component radius4 of derived type eddy and field radius4 of
`outermost_contour.dbf`. They are not used any longer.

Since we now have the test `SHPC_degenerate`.

To replace `Inst_eddies/Tests/Input/SHPC_degenerate`. The motivation
is to have the `cont_list` shapefile, so we can use it with
`test_set_max_speed`.

Because there is no time dimension in
`Inst_eddies/Tests/Input/uv_outermost.nc`, for example.

Abandon the radius4 approach, because the resulting max-speed contours
had speeds significantly lower than those from Matlab and because the
approach with radius4 is difficult to extend to a non
longitude-latitude grid.

Demote dummy arguments nlon and nlat of `input_ssh` to local
variables. nlon and nlat are no longer used in main program unit
`inst_eddies` since commit 03033711.

Fuse the loops on outermost contours and maximum speed contours.

Because we want to fuse the loops on outermost contours and maximum
speed contours.

Rename file `set_all_outerm.f90` to `set_all_contours.f90`.

Rename procedure `set_all_outerm` to `set_all_contours` and module
`set_all_outerm_m` to `set_all_contours_m`.

Because `test_set_all_outerm` is now essentially the same as
`inst_eddies`. Replace `test_set_all_outerm` by `inst_eddies` in
tests.

Since this information is not in the SHPC.

Speed components are now defined in `set_all_outerm`.

Move computation of max-speed contours to `set_all_outerm`. This
requires adding dummy arguments u and v to `set_all_outerm`. The
motivation is to compute the max-speed contour for each eddy
immediately after computing its outermost contour.

Do not set components for extrema without outermost contours. We do
not care about these elements of the snapshot, they will not be
written to the shapefiles.

Restrict field to outermost contour instead of using `outside_points`,
following removal of argument `outside_points` of procedure
`set_max_speed`.

Remove argument `outside_points` of `set_max_speed`.

Move the second test on `self._ishape_last[i_slice][orientation]`
inside the first test. Avoid the double test on
`self._ishape_last[i_slice][orientation]` when
`self._ishape_last[i_slice][orientation]` is not None on entry of the
function. If `self._ishape_last[i_slice][orientation]` is not None on
entry of the function then, necessarily, the assertion on
`self._ishape_last[i_slice][orientation].size` and the definition of
`self._e_max[i_slice][orientation]` have already been done because
`self._ishape_last[i_slice][orientation]` and
`self._e_max[i_slice][orientation]` are only defined from the function
get_ishape_last.