remove isAccountable property, as a method with the same name exists as well

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@19832 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5/Document/Order.py

@@ -42,7 +42,6 @@ class Order(Delivery):
     meta_type = 'ERP5 Order'
     portal_type = 'Order'
     isDelivery = 1
-    isAccountable = 0
 
     # Declarative security
     security = ClassSecurityInfo()