Remove `shpc_create` from use list in main program `test_overlap`. It
is no longer needed since commit 50d2f596.

Remove `shpc_create.f90` from source files of target `eddy_graph`. It
is no longer needed since commit 50d2f596.

Update to commit cb25161 from cmake repository.

Add test for existence of target `NetCDF_Fortran::NetCDF_Fortran`. If
the target already exists, because `find_package(NetCDF_Fortran)` has
already been called then we cannot create again the target. This
happens if we are a sub-project of a project that first creates the
librairies.

In case we are a sub-project.

Assuming the englobing project builds the corresponding librairies.

The procedure does not exist any longer.

A node is no longer identified by date and eddy index.

One can manually add the key cyclones to the returned dictionary.

Replace `tests_old_dir` by PWD for tests in the same series.

Move content of `tests.json` to the end `Tests/short_tests.json`.

There were only three files in `Overlap/Analysis`.

There are other files in `Overlap/Tests/Input` with the same content as
removed files. The redundancy came from commit c58c21b7.

Add `node_id_param.json` to requirements of `report_graph.py`.

Since we now produce from Fortran edgelists with node indices, we use
`report_graph_int.py`.

Instead of filenames constructed from the orientation. So we need to
create symlinks before running the script. It is clearer this way that
the script processes a single orientation, and that the processing
does not depend on the orientation. The script does not take a command
line argument any longer.

Rename variable `N(anti|cyclo)` to `N_eddies` in file
`N(anti|cyclo).mat`. Motivation: allow more transparent processing in
`overlap_v6.py`.

Rename `edgelist_no_header.csv` to `edgelist_unsorted.csv`.

Write file `node_id_param.json` from programs `test_overlap` and `eddy_graph`.

Write node indices instead of dates and eddy indices in
edgelist. Compute `e_overestim` from `ishape_last`. Remove header
lines of edgelist. See commit 3370733a. Replace argument d of procedure
overlap by arguments `e_overestim` and k.

Do not create file `number_eddies.csv` in program `eddy_graph`. Since
there are no interpolated eddies any longer, the file
`number_eddies.csv` just contained the same information that is in
`ishape_last.txt` in the input SHPC. Remove argument
`unit_number_eddies` of procedure `dispatch_snapshot`.

Do not create attribute interpolat of nodes in graph. There are no
longer nodes that should be drawn with a box.

No longer useful since there are no interpolated eddies any longer.

Remove component `number_eddies` of derived type snapshot. It was the
same as `number_vis_extr` since there are no interpolated eddies any longer.