[FIX] mail: missing decorators, leading to old API / new API

mismtach.

addons/mail/models/res_partner.py

@@ -30,5 +30,6 @@ class Partner(models.Model):
             partner._message_add_suggested_recipient(recipients, partner=partner, reason=_('Partner Profile'))
         return recipients
 
+    @api.multi
     def message_get_default_recipients(self):
         return dict((res_id, {'partner_ids': [res_id], 'email_to': False, 'email_cc': False}) for res_id in self.ids)

addons/mail/models/res_users.py

@@ -72,6 +72,7 @@ class Users(models.Model):
         # TODO change SUPERUSER_ID into user.id but catch errors
         return self.partner_id.sudo().message_post(body=body)
 
+    @api.multi
     def unlink(self):
         # Cascade-delete mail aliases as well, as they should not exist without the user.
         aliases = self.mapped('alias_id')