budget cell : some more fixes thanks to julien

define security on the right class
use newstyle class so that slots is effective
cleanup whitespace and indentation

product/ERP5/Document/BudgetLine.py

@@ -36,7 +36,8 @@ from Products.ERP5.mixin.variated import VariatedMixin
 from Products.ERP5Type.Cache import transactional_cached
 from ZTUtils import make_query
 
-class TempBudgetCell:
+class TempBudgetCell(object):
+  __allow_access_to_unprotected_subobjects__ = 1
   __slots__ = ('amount', 'cell_index', 'url', 'engaged_budget')
   def __init__(self, amount, cell_index, url, engaged_budget):
     self.amount = amount
@@ -82,7 +83,6 @@ class BudgetLine(Predicate, XMLMatrix, VariatedMixin):
   meta_type='ERP5 Budget Line'
   portal_type='Budget Line'
   add_permission = Permissions.AddPortalContent
-  __allow_access_to_unprotected_subobjects__ = 1
 
   # Declarative security
   security = ClassSecurityInfo()