[FIX] stock: post messages on stock.pciking instead of stock.picking.in/out to be able to display messages on the form

This will only display newly posted messages, not already existing.
To do so apply the following SQL command:
UPDATE mail_message SET model = 'stock.picking' WHERE model = 'stock.picking.in' OR model = 'stock.picking.out';

lp bug: https://launchpad.net/bugs/1197169 fixed

bzr revid: mat@openerp.com-20130828151434-5nu7o0ybguh86w6f

addons/stock/stock.py

@@ -3005,6 +3005,10 @@ class stock_picking_in(osv.osv):
         #instead of it's own workflow (which is not existing)
         return self.pool.get('stock.picking')._workflow_signal(cr, uid, ids, signal, context=context)
 
+    def message_post(self, *args, **kwargs):
+        """Post the message on stock.picking to be able to see it in the form view when using the chatter"""
+        return self.pool.get('stock.picking').message_post(*args, **kwargs)
+
     _columns = {
         'backorder_id': fields.many2one('stock.picking.in', 'Back Order of', states={'done':[('readonly', True)], 'cancel':[('readonly',True)]}, help="If this shipment was split, then this field links to the shipment which contains the already processed part.", select=True),
         'state': fields.selection(
@@ -3056,6 +3060,10 @@ class stock_picking_out(osv.osv):
         #instead of it's own workflow (which is not existing)
         return self.pool.get('stock.picking')._workflow_signal(cr, uid, ids, signal, context=context)
 
+    def message_post(self, *args, **kwargs):
+        """Post the message on stock.picking to be able to see it in the form view when using the chatter"""
+        return self.pool.get('stock.picking').message_post(*args, **kwargs)
+
     _columns = {
         'backorder_id': fields.many2one('stock.picking.out', 'Back Order of', states={'done':[('readonly', True)], 'cancel':[('readonly',True)]}, help="If this shipment was split, then this field links to the shipment which contains the already processed part.", select=True),
         'state': fields.selection(