[IMP] mail*: implement auto-deletion mechanism for mail.message, mail.mail and the attachment

This is based on the auto_delete flag on mail.mail
and the assumption that mail.mail records created
without a parent message will be deleted as a whole,
including the parent message and its attachments.
This is contrasted with mail.mail records created
for notifications regarding a mail.message, and therefore
created with an existing `mail_message_id` parent.
For this last case the parent must not be deleted
along with the child mail.mail, as it exists on its own.

bzr revid: odo@openerp.com-20120905151950-7jv6hi0x5fx5iytp

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