Not necessary anymore in 3.1.0 since :
* N°4875 - Compiler : do not force the model.*.php file to be present in the module.*.php file ('datamodel' key)
* N°4280 - Module loading : do not crash if 'datamodel' file doesn't exists (model.*.php)
* merging 3.0 into develop
* N°5102 - Allow to send emails (eg. notifications) using GSuite SMTP and OAuth
* migration to iTop 3.1
Co-authored-by: Eric Espie <eric.espie@combodo.com>