add an option to share the phone number of the president to others assos

• add a check box in the mandat edition page to allow them to agree to share there phone number
• according to this info, display or not the number in the annuaire view.
• add a "?" mark on the button to give more infos when the user hover In order to display it as soon as possible, I collected their consent when signing the charte de com so i can do it manually when this feature is in place.