It is useless to add to an attribute to v since, after the current
iteration, v will be isolated, and so it will not be used in remaining
iterations, and moreover it will be deleted after the loop.

Do not delete delete v just because it is isolated. v may have become
isolated at an earliest iteration because it is the first eddy in an
isolated segment. The bug is demonstrated with test `Edgelist_Isic_2`,
where vertex 29 was erroneously deleted.

So the comparison with `segments.py` is easier.

So the comparison with `segments.py` is easier.

So the comparison with `segments.py` is easier.

For easier comparisons.

Following creation of sub-directory `Trajectories/Tests`.

Same as `edgelist_Isic_1.csv` but with lines out of order.

Rename `edgelist_test.csv` to `edgelist_Isic_1.csv`.

May be useful for comparison with `segments.py`.

Accept input graph of segments without cost functions and accept
absence of file `traj_segm.json`.

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.