Fix issue with Zimbra server 7.x : WaitSetRequest have not defTypes t (tasks), so we replace "m, a, t" parameter defTypes (message, appointments and task) by "all" to get all notifications of change
fix issue when we receive many mails in a message with the same subject; now, we show correctly the sender email of the new mail in this message and notify this new mail, even if it has already unread mails in this message