[MERGE] Fixes some posting/email_template issues. Also cleans an old hack about res...

[MERGE] Fixes some posting/email_template issues. Also cleans an old hack about res.users view redirected to its related res.partner.
Addons-side:
- res.users wraps the 2 posting methods, because mailboxes are still related to the user, not the partner, due to some technical issues
- mail.compose.message using email_template: _reopen is back, as the spec of a wizard should be that hitting a button close it. Therefore _reopen is necessaru to reopen the wizard with its previous value, to continue working on it.

bzr revid: tde@openerp.com-20121115125113-oxn2vwunsvkinxkd