Enable the check of costs of production again. Tryton core already made some changes.

issue136_416.diff

@@ -1,16 +0,0 @@
-Index: production.py
-===================================================================
-
---- .a/trytond/trytond/modules/production/production.py
-+++ .b/trytond/trytond/modules/production/production.py
-@@ -441,6 +441,9 @@
-             production.check_cost()
- 
-     def check_cost(self):
-+        # avoid this check because it could be little differences because of
-+        # rounding problems
-+        return
-         if self.state != 'done':
-             return
-         cost_price = Decimal(0)
-

series

@@ -1,7 +1,6 @@
 stock_lot_expand_lot_required.diff
 account_move_line_rule.diff
 issue154_316.diff
-issue136_416.diff
 issue10467.diff
 issue130_392_10919.diff
 issue239_630.diff