Update to new francedata schema

representatives_votes/contrib/francedata/import_dossiers.py

representatives_votes/contrib/francedata/import_scrutins.py

representatives_votes/contrib/francedata/import_votes.py

...ves_votes/contrib/francedata/tests/dossiers_expected.json

...atives_votes/contrib/francedata/tests/dossiers_input.json

...ves_votes/contrib/francedata/tests/scrutins_expected.json

...atives_votes/contrib/francedata/tests/scrutins_input.json

...atives_votes/contrib/francedata/tests/votes_expected.json

...entatives_votes/contrib/francedata/tests/votes_input.json

representatives_votes/migrations/0009_dossier_ext_link.py

representatives_votes/models.py