[MERGE] Merged OpenChatter part3: The Return of the Composer Reloaded Strikes Back...

[MERGE] Merged OpenChatter part3: The Return of the Composer Reloaded Strikes Back. Addons-side branch of OpenChatter part 3, holdling the new composer. This revision adds a new composer for chatter :
      - now based on mail.compose.message form view
      - comment mode / email mode, allowing to add partners in CC (with autocomplete for some models using an improved version of mail.compose.message such as crm.lead)
      - plain / HTML composition mode, with a rich HTML composition form
      - email.template support
      - EDI support
      Other modifications :
      - mail.group improved, with linked groups to automatically subscribe users
      - welcome message for a new user and a new employee
      - mail.message subtype is renamed to content_subtype.
      - crm.add_note is deleted
      - some doc ... but not as much as expected

bzr revid: tde@openerp.com-20120720153237-nk50okkpg1kju9fb