spherical_polygon_area to spher_polygon_area.

In procedure max_speed_contour_ssh, instead of aborting when the speed
is not defined, continue with missing_ssh. Found such a case in
November 29th, 2015 data. Added corresponding test. In procedure
set_max_speed, if max_speed_contour_ssh returns missing_ssh then we
just take the outermost contour as max-speed contour.

outside_points(1, :) if necessary in procedure get_snapshot; read
max_radius at run-time. Add a corresponding test.

procedure so it can be used by program test_set_all_outerm.

Move dummy argument corner of set_all_outerm to last position.

Bug fix in procedure get_snapshot: urc(2) must always be lower than
nlat, even if periodic is true. Fix the same bug in procedure
set_all_outerm: llc(2) >= 1 and urc(2) <= nlat even if periodic is true.

Bug fix in procedure set_all_outerm: the lower bound of dummy argument
ssh is not always 1.

Make script examine_ssh_values.py work for a periodic domain.

Make program test_set_all_outerm work for a periodic
domain. max_radius is now chosen at run-time (we must change it for
a very coarse grid). Add a corresponding test.

In written shapefiles, replace field "area" by field "r_eq_area",
that is radius of disk of equal area. This is a smaller number so it
needs fewer characters, especially for a global coarse grid.

reading and spares some disk space: we can reduce the size of the
field from 20 to 14 characters. We do not loose precision with this
reduction because the order of magnitude of the area is 1e3 km2 or
more so the decimal part of the field was 0. Accordingly, change the
are for a null contour from - 1 to - 1e6 m2.

Bug fix in program test_set_max_speed. No need for width 20 for field "speed".

validity of an eddy depending not only on its amplitude but also its
surface. (Note that, in this version, the component valid is redundant: one
can simply test the component out_cont%n_points.)

>= 0 everywhere outside of procedure local_extrema.

In test Nearby_extr, use output from Get_snapshot_region_1_noise since
we now use suff_amp in extremum shapefile.

than extr_map /= i.

Preparing to remove the coding of sufficient amplitude in extr_map: do
not use anywhere the sign of extr_map, use the component suff_amp of
the type eddy instead.

In program test_successive_overlap, I would rather not use default
values for namelist variables.

Add a larger test for successive_overlap, to have eddies wih
insufficient amplitude in the region.

Stdin to Input. Two input dir provided for in tests.json: $input_dir
and $large_input_dir.

Rename everywhere variable nearby_extr to outside_points to avoid
confusion with function nearby_extr. Rename file "nearby_extr.csv" to
"outside_points.csv".

In procedure nearby_extr, include in the selection extrema with
different sign, even if they do not have sufficient amplitude.

Bug fix in read_eddy: use the value of read attribute to define
e%interpolated.