[IMP] event: apply various usability improvements

 * reporting: remove report.event.registration as it can be replaced by
   pivot and graph views on event.registration model directly. The
   custom SQL view does not add any valuable information;
 * event: correctly take limitations from event category and check
   minimum seats is lesser or equal to maximum seats;
 * event: reorganize a bit the form view

  * avoid some kind of random ordering of buttons;
  * move seats availability directly in the form view;
  * ticket page is now used only for ticketing purpose, not a mismatch
    with seats;

 * registration: attendees can be set as done only for confirmed events
   to avoid confusion when working with draft events;

Misc usability

 * event.type: rename event type to event category to have a unified
   term across various event addons;
 * event: stop tracking active field as it does not add interesting
   information; it should not toggle everyday;
 * event: track location as it does add valuable information;
 * event: rename some labels to ease user experience;
 * event.mail: add missing description and rec name;

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