[FIX] stock: do not propagate changing of quantities of moves to the next move anymore

In v7, it could be in handy that when altering the quantities of a move, it would automatically
update the next chained move as you could change quantities on the fly without any relation
to the original documents.
From v8, this is all being handled by extra moves which might e.g. follow
a different route, so you still know what is related to the original procurement.
But the functionality stayed in the code for who would still need it.
In v10 and in previous versions, manufacturing orders however still use these moves.

When we update the quantity on a halfproduct (which we can do now all the time in v10,
it could change the consumption where it is used in the finished product (in MTO)
That is why it is better to remove this functionality.
(it might also speed up the split method on stock_move)

The propagation of quantities was something from v7, that now causes trouble in mrp for nothing

addons/stock/models/stock_move.py

@@ -264,11 +264,6 @@ class StockMove(models.Model):
             raise UserError(_('Quantities, Units of Measure, Products and Locations cannot be modified on stock moves that have already been processed (except by the Administrator).'))
 
         propagated_changes_dict = {}
-        #propagation of quantity change
-        if vals.get('product_uom_qty'):
-            propagated_changes_dict['product_uom_qty'] = vals['product_uom_qty']
-        if vals.get('product_uom_id'):
-            propagated_changes_dict['product_uom_id'] = vals['product_uom_id']
         #propagation of expected date:
         propagated_date_field = False
         if vals.get('date_expected'):