fix issues caught by flake8 and add CI job to run linter
Adds job to run flake8 against the sources to catch PEP 8 violations and other coding errors.
Fixed all issues already caught by flake8 (minus a few that have been explicitly ignored).
La vérification des quotas de chaque projet est mise en place en mode non bloquant. Plus d'information sur : https://doc-si.inria.fr/pages/viewpage.action?pageId=146834656
Quota verification is enabled for projects in non-blocking mode. More information: https://doc-si.inria.fr/pages/viewpage.action?pageId=146834656
Adds job to run flake8 against the sources to catch PEP 8 violations and other coding errors.
Fixed all issues already caught by flake8 (minus a few that have been explicitly ignored).