Share event with other open planner member

[GerardPaligot]

Be able to add edit mode for an event to another Open planner member

[HugoGresse]

This will not be done before 1 or 2 years. It need some work. The work arround is to use a shared account as stated in the login page "Use a single account per event or organization as OpenPlanner don't have a role system yet."
If someone want to help do it, let me know!