The attribute written was always true.

Since we now only write valid eddies to shapefiles.

Otherwise we get a harder to understand error from numpy.

This is useful is an SHPC is missing an orientation.

Allow missing `ishape_last.txt` in method `comp_ishape`. This is
useful is an SHPC is missing an orientation.

Bug fix: do not provide standard input for `inst_eddies_Aviso.py`, it
does not read it.

Use out_cont%closed instead.

`Inst_eddies_12` uses the current revision and so does not contain
invalid eddies.

Move test `R4_15_splitted` before the tests that use it.

Instead of `Inst_eddies_10_splitted`.

Because stat is a module from Python standard library.

Only useful for tests.

Allowing the module to be imported and used conveniently from Python.

This avoids copying `cont_list(n_cont)` to `out_cont` if it has
insufficient area.

Add dummy arguments `cont_list` and `n_cont` to `get_1_outerm`.

Because we are going to add another intent out argument.

Remember that we do not write invalid eddies to shapefiles, so there
are no null shapes in `outermost_contour.shp`. So, in order to predict
the size of output, the interesting statistics is the number of points
divided by the number of non-null outermost contours.

Keep the good contours found when looking for the outermost contour,
subject to a maximum of `n_max_cont` contours. The idea is to use them
later when looking for the maximum-speed contour. Inside function
`get_1_outerm`, we temporarily store the good contours in a local
explicit-shape array, `cont_list`.