Edge flip

[Oscfon]

Implement more methods for fat graphs

• add_edge(), add_loop(): insert an isolated edge or loop
• swap(i, j): multiply by a transposition (induces either a vertex split or merge as well as a face split or merge)
• move_dart(i, j): reallocate dart i close to dart j

The already implemented method split_face and split_vertex can be realized using the more atomic operations swap (see the docstring of split_face and split_vertex). Though, we keep their implementations as the newly introduced methods perform relabelling.

Checklist

• Added an entry in doc/news/.
• Added a test for this change.

[videlec]

@Oscfon Finalement, j'ai remplacé tes fonctions par cut_vertex et glue_vertices qui sont plus générales. J'ai aussi écrit la gestion des labels et les tests. Il faudrait que tu adaptes ton code pour iso-Delaunay.

[videlec]

@Oscfon J'ai finalement factorisé avec une méthode plus générale swap(i, j). Il faut voir si on garde cut_vertex et glue_vertices qui font simplement un appel à swap.

[videlec]

Documentation complains with zenodo

URL        `https://zenodo.org/badge/latestdoi/347440823'
Name       `zenodo website'
Parent URL http://localhost:8880/surface-dynamics/, line 390, col 56
Real URL   https://zenodo.org/records/13356803
Check time 3.488 seconds
Size       13.12KB
Warning    [http-redirected] Redirected to
           `https://doi.org/10.5281/zenodo.13356803' status: 302
           FOUND.
           [http-redirected] Redirected to
           `https://zenodo.org/doi/10.5281/zenodo.13356803'
           status: 302 Found.
           [http-redirected] Redirected to
           `https://zenodo.org/records/13356803' status: 302
           FOUND.
Result     Error: 500 INTERNAL SERVER ERROR