Purpose of this commit is to re-arrange mass mailing buttons and to add
a button for scheduling mass mailing in future :
* add schedule date in debug mode;
* re-arrange all button;
* add schedule in future button and on click open wizard to schedule future
date;
* on 'send now' button remove the useless '|' in domain;
* add a small wizard to select the send date;
This commit is related to task ID 46932