Merge branch '1.4.x' into 'master'

.gitlab-ci.yml

beat/web/accounts/api.py

...b/accounts/management/commands/year_revalidation_users.py

beat/web/accounts/migrations/0011_check_all_accounts.py

beat/web/accounts/urls.py

beat/web/algorithms/admin.py

beat/web/algorithms/api.py

beat/web/algorithms/api_urls.py

beat/web/algorithms/migrations/0001_initial.py

beat/web/algorithms/migrations/0004_algorithm_type.py

beat/web/algorithms/models.py

beat/web/algorithms/serializers.py

beat/web/algorithms/static/algorithms/js/editor.js

beat/web/algorithms/templates/algorithms/edition.html

beat/web/algorithms/templates/algorithms/panels/editor.html

beat/web/algorithms/tests/core.py

beat/web/algorithms/tests/tests_api.py

beat/web/algorithms/views.py

beat/web/attestations/api.py

beat/web/attestations/views.py