[FIX] When duplicating a production order, clear existing stock moves

If a production order is duplicated, it will be because someone wants to
build the same item(s) again. The copy function already puts the production
order back into state draft but does not delete the related stock movements
and consumed products.

bzr revid: chris.halls@credativ.co.uk-20100416152429-2ygxfb32lvew3bgl

addons/mrp/mrp.py

@@ -560,8 +560,12 @@ class mrp_production(osv.osv):
         default.update({
             'name': self.pool.get('ir.sequence').get(cr, uid, 'mrp.production'),
             'move_lines' : [],
-            'move_created_ids': [],
-            'state': 'draft'
+            'move_lines2' : [],
+            'move_created_ids' : [],
+            'move_created_ids2' : [],
+            'product_lines' : [],
+            'state': 'draft',
+            'picking_id': False
         })
         return super(mrp_production, self).copy(cr, uid, id, default, context)