[IMP] event_track: make tracks easier to use

Purpose of this commit is to clean and ease the use of tracks in
event management.

 * status is change to stages. Those are global for all event as we
   consider track acceptation process as similar across events;
 * change speakers many2many to a one2many. Most event have only one
   speaker or at least a main speaker;
 * add various chatter features: tracking of template, subtypes,
   suggested recipients, ... Also add activities on tracks and their
   various filters;
 * add automatic mailing on stages like already done in tasks or
   issues;
 * tweak display of tracks on agenda. Event manager see unpublished
   tracks with the right label in order to know the status of the various
   event tracks.

0 files changed, 0 insertions, 0 deletions