We do not want a symbolic link `$tests_old_dir/Extract_component_nx_2`
to be created if directory `$tests_old_dir/Extract_component_nx_2`
does not exist.

The description was wrong since commit e35226da.

Do not use option `--node` in test of `plot_components.py`, since we
are going to remove it.

The Graphviz file can be created with `edgelist_to_Graphviz.py`.

Move part of tests to new test series in sub-directory.

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

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

Do not try to read attributes of interpolated eddies when reading a
graph. Remove option `--interp` of scripts `report_graph.py` and
`report_graph_int.py`. Remove argument `read_interp` of function
`read_eddy_graph` in both scripts.

Do not specify the orientation as a command line argument of
`report_graph_int.py`. As in commit 292305e.

For test `Report_graph_cyclo`.

Do not specify the orientation as a command line argument of
`report_graph.py`. We are reverting commit 0ca2da8c because now
edgelists and SHPC for interpolated eddies are normally in separate
directories, and edgelist is normally just `edgelist.csv`.

We are reverting commit b926e1b7 because now there are two SHPC input
directories for visible eddies, two SHPC for interpolated eddies and
edgelists in differents directories for the two orientations. Handling
the command line arguments would be awkward.

This SHPC was made with an old version of `inst_eddies`: it contains
cyclones and anticyclones output together. We use
`$tests_old_dir/Extraction_eddies_region_2_noise/SHPC_anti_all_dates`
instead. See also commits 488d5c08 and 8ed324ff.

Required since commit 1eca0742.

From directory Analysis. Extract corresponding tests from
`Analysis/tests.json` into new file `Inst_eddies/Analysis/tests.json`.

The bug comes from commit ce139a86.

Move the contents of these directories up one level, renaming them.

Take into account new structure of repository in JSon test files.

Also split the tests, Fortran source files, Python files and JSon
files. Keep at the top level the files used in both `Inst_eddies` and
Overlap.

Motivations for the split:

- The top directory contained many files.

- It may be useful to compile only one of the two sub-projects. For
example, only `Inst_eddies` on Ciclad, where MPI 3 is not available.