We also change the rule on the input value of `n_dates`. Before we could
have a finite value of `n_dates` if there was a single slice. Now if
we want a finite value of `n_dates` then we have to specify a slice,
even if there is only one. This seems clearer.

There is not much point in keeping a separate experience for
2006/1/1-2006/15/1.

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`.

Only useful for tests.

Because the numbering changed when we decided not to write invalid eddies.

Use test `Region_5_15_days` instead of outside experiment `Inst_eddies_4`.

We will need this new shapefile in program `eddy_graph` only for a non
longitude-latitude grid. We add a new dummy argument `grid_lon_lat` to
procedure `shpc_create` to decide whether we create the shapefile
`extr_proj`.

It seems simpler than putting it in `$large_input_dir`. I do not see a
drawback.

Add executable in the directoy containing the main program unit. This
is clearer as the executable file will be created in the corresponding
binary directory. Since the directory Overlap is added after
`Inst_eddies`, targets defined in `Overlap/Tests` are not yet defined
when processing `Inst_eddies`, so we cannot use `target_sources` for
these targets in `Inst_eddies`. So we use a relative path to
`Inst_eddies` from `Overlap/Tests`.

The program `test_weight` no longer exists, since commit 9ff8a9bb.

Introducing `config_graph_nml`.

Following commit 3289c070.

Update `CMakeLists.txt` files for `test_get_dispatch_snap`.

Update `CMakeLists.txt` files to take into account commit 3289c070.

Remove dummy arguments nlon, nlat, copy of procedure `save_snapshot`,
use module variables instead.

Update `CMakeLists.txt` files to take into account commit 3289c070.