'Override of __init__ to add access rights on notification_email_send
and alias fields. Access rights are disabled by default, but allowed
on some specific fields defined in self.SELF_{READ/WRITE}ABLE_FIELDS.'

def __init__(self, pool, cr):

    init_res = super(Users, self).__init__(pool, cr)
    type(self).SELF_WRITEABLE_FIELDS = list(self.SELF_WRITEABLE_FIELDS)
    type(self).SELF_WRITEABLE_FIELDS.extend(['notify_email'])
    type(self).SELF_READABLE_FIELDS = list(self.SELF_READABLE_FIELDS)
    type(self).SELF_READABLE_FIELDS.extend(['notify_email'])
    return init_res
