These files will usually be created in the same directory.

Rather than from current series of tests.

Previously the script worked only for dates in slice 0.

It seems clearer here.

Preparing for dates at different slices, which will need different
readers.

Correct the test to know whether we can use part of the properties
already calculated for the beginning of the segment. When `len_seg ==
2 * n_days_avg`, `g.vp.inst_eddies[n][-n_days_avg:] =
g.vp.inst_eddies[n][n_days_avg:]` so
`g.vp.inst_eddies[n][:n_days_avg]` and
`g.vp.inst_eddies[n][-n_days_avg:]` are disjoint. The bug comes from
commit bdd0ce41.

`plot_traj.*` is the output of `plot_traj.py`. We should have renamed
the output file when we renamed the script in commit 328c6e3b.

So we can run only individual tests if we want.

Because we want to factorize what follows.

Edge list file is not necessarily in current directory since commit
c328203b.

So that corresponding dates are in a possible
order. `edgelist_Isic_2.csv` still has the same edges than
`edgelist_Isic_1.csv` in a different order. Note that we also have to
change `e_overestim`.

Following the  move of `extract_component.py`.

Move script `extract_component.py` from directory Trajectories to
directory Overlap. It does not deal with trajectories and it does not
need the input graph to be a graph a segments.

Downgrade `sort_ssh` from argument of procedure `complete_ssh` to
local variable. `sort_ssh` is not used any longer in procedure
`set_max_speed` since commit 4a64f87d.

Instead of using a submodule. See Scott (2023 k1077, § 39.6.2 "Sharing
CMake Modules And Commands"). The drawbacks are: the directory cmake
is duplicated in each build directory; configuration requires a
network connection. The advantages are: it is easier to download the
project without git; we can more easily package a release.

So we do not call `time.perf_counter()` a second time after a simple
assignment.

This is useful to find the shortest path between the beginning and the
end of a trajectory, or to create a histogram of the number of
trajectories per component.