refractor Open Agenda
Created by: RaphaelRIVIERE
Doc : https://docs.google.com/document/d/1kbVc8DVR3kkYsoRGZ5GVXBTYxBc8cIC6CgKPYUe5_a0/edit#
Schéma : https://docs.google.com/drawings/d/1-WwS9CaW6qO_Bjhn-Eyir8IBl8h8LJPvDQo7VIs2Ilc/edit
Prendre en compte le nouveau format des événements et corriger le bug #821 #561 (closed) #538 (closed)