Fix ffi napi
Replace old FFI packages with their newer ffi-napi equivalents, plus a couple collateral things (updated readme, package description, config for jshint)
[A venir] Mise en place de quotas sur nos instances GitLab. Plus d'information sur : https://doc-si.inria.fr/pages/viewpage.action?pageId=129728565
[Coming soon] Quotas installation on our GitLab instances. More information: https://doc-si.inria.fr/pages/viewpage.action?pageId=129728565
Replace old FFI packages with their newer ffi-napi equivalents, plus a couple collateral things (updated readme, package description, config for jshint)