[MERGE] OpenChatter "Last day before World's End" merge.

Message subtype update.
Mail:
- added a tracking mechanism compatible with message subtypes. Using a model-defined structure (see mail_thread), modified fields are tracked at write and generate logging messages that can be attached to one or several subtypes (i.e. opportunity won/lost)
- added a mechanism to automatically subscribe followers of a 'parent' document to a 'child' document (i.e. project -> task, project -> issue, salesteam -> crm). This is done by propagating subscription of subtypes, using a parent_id and relation_field on subtypes.
Addons:
- update to use the tracking mechanism. This allows to remove almost all message_post and send_note methods in the code, as those methods were generally simple logging methods
- update to the the automatic followers subscribe
- updated subtypes
- added some tests
- removed dead code about old needaction, logging or chatter
- some bug fixes

bzr revid: tde@openerp.com-20121220144731-bd2xzz3au7s9994y

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