0ce6b1b4.

Write extr_map in test_read_snapshot since extr_map has been
defined. So create a procedure write_extr_map because now we want to
write extr_map both in test_local_extrema and in test_read_snapshot.

Preparing to take into account periodicity in successive_overlap: add
argument periodic to read_snapshot and extend s%extr_map in longitude
if periodic.

In program extraction_eddies, constraint on max_radius(1) is necessary
only if periodic.

Make read_snapshot more general: add argument step.

In procedure get_snapshot, remove definition of s%number_eddies
because this is already done in read_snapshot.

Promote dist_lim from local constant of successive_overlap to constant
of module successive_overlap_m because we need it in read_snapshot
(and test_successive_overlap and test_read_snapshot).

values at longitude boundaries, in case of periodicity.

Add argument "periodic" to procedures get_snapshot and
set_all_outerm. Duplicate values at longitude boundaries in ssh, u, v
if periodic. set_all_outerm can now call local_extrema with periodic
true. In procedure set_all_outerm, we shift the longitudes of outside
points if necessary.

In program test_get_snapshot, define periodic from step and nlon.

internal procedure.

In procedure local_extrema, if periodic, pass arrays "field" and
"extr_map" with a duplicate column at each bound. Then there is no
need to copy to local 3x3 arrays. Add argument my_lbound.

first dimension of input field. So there may be extrema on the borders
and we have to create a private procedure local_extremum.

Added scale option to script plot_snapshot.py.

read_snapshot, assert that there is no duplicate tuple in
s%ind_extr. Since we are not sure of that, we must use a do construct
and not a forall in order to define s%extr_map.

Bug fix in program test_local_extrema: support missing values. Add
corresponding test.

Output s%ind_extr in program test_read_snapshot.

acceptable. So define flat_extr by a strict inequality in procedure
get_snapshot.

Procedure set_outermost_contour no longer has a dummy argument
noise_around. We no longer call outermost_possible_level so we do not
have an artificial discontinuity of results with and without maximum
amplitude. We abandon the idea of reducing the amplitude of initial
level_good compared to innermost_level: problem of consistence with
get_snapshot, and it does not seem worth the trouble, just abandon
those problematic extrema. Allow for null outermost_contour instead of
aborting.

In procedure get_snapshot, s%list_vis(i)%suff_amp is first defined
only if flat_extr(i). Also we are no longer sure that
set_outermost_contour finds an outermost contour so we have to test
this to define s%list_vis(i)%suff_amp. noise_around is now defined
only for flat_extr(i) and s%list_vis(i)%suff_amp. Also, since we may
not find an outermost contour even if not flat_extr(i), we update
s%extr_map after the second call to set_outermost_contour.

In procedure local_extrema, we use the mask diff_center instead of
mask_center. So we no longer need procedure construct_mask_center. In
procedure local_extrema, we ignore one in two adjacent degenerate
extrema instead of aborting.

In plot_snapshot.py, color extrema and allow for null outermost
contour.

Synthesize output in test_local_extrema.py.

low-amplitude threshold, min_amp.

Add component suff_amp to derived type eddy. Write this component in
extremum_$m.dbf.

In shapefiles, write positions of vertices in degrees rather than
radians.

test_get_snapshot reads the whole domain of input NetCDF files instead
of selecting a window through a namelist. This is clearer and more
convenient. Same in test_get_snapshot.py, test_local_extrema and
test_local_extrema.py.

In test_get_snapshot.py, annotate extrema instead of inserting a
legend.

More correct names: radian_per_degree to deg_over_rad,
degree_per_radian to rad_over_deg.

test_good_contour has more general input.

test_inside tests only inside, no loop on radius.

Choose longitude and latitude window at run-time in test_local_extrema.

local_extrema instead of coding sense of rotation with the sign of
extr_map.

In makefile, we want tags to include sources for test_good_contour,
etc. External file list becomes easier.

Moved test_bilinear_interp.f and test_bilinear_interp.py out of the
project. These are rather tests on Numer_Rec_95.

In test_local_extrema, write to CSV file instead of stdout.