[MERGE] Perform auto-join and mailboxes+needaction speed udpate. Addons-side branch, holding an update of functional fields to use _auto_join and refactoring of starred messages implementation.

mail_thread
- updated the message_unread function field, now returning a domain on mail_message notifications. This domain is quite complex and redundant, but mandatory in 7.0 considering the limitations of _auto_join
- message_ids is now using auto_join
- removed message_comment_ids field, not necessary and that lead to confusing data on kanban views
mail_message:
- notifications_ids is now using auto_join
- refactored the todo, now delegated to the notifications
- the favorite_user_ids field is therefore removed, and various methods updated
- updated _search_to_read and _search_starred to return a domain on notifications
- updated the domains of the mailboxes accordingly

bzr revid: tde@openerp.com-20121210154452-ngy6lw1jg97ib5gn

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