add a 'constraint' portal type group to group all Constraint portal types

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@43112 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ERP5Type/ERP5Type.py

@@ -239,7 +239,7 @@ class ERP5TypeInformation(XMLObject,
     # with great care.
     defined_group_list = (
       # Framework
-      'alarm', 'rule',
+      'alarm', 'rule', 'constraint',
       # ERP5 UBM (5 Classes)
       'resource', 'node', 'item',
       'path', # movement is generated from all *_movement group above.