erp5_catalog: Add Portal Script portal_type in allowed_types for ERP5 Catalog

product/ERP5/bootstrap/erp5_catalog_transition/PortalTypeAllowedContentTypeTemplateItem/allowed_content_types.xml

 <allowed_content_type_list>
+ <portal_type id="Catalog">
+  <item>Python Script</item>
+ </portal_type>
  <portal_type id="Catalog Tool">
   <item>Catalog</item>
  </portal_type>

product/ERP5/bootstrap/erp5_catalog_transition/bt/template_portal_type_allowed_content_type_list

 Catalog Tool | Catalog
+Catalog | Python Script
\ No newline at end of file

product/ERP5Catalog/ERP5Catalog.py

@@ -52,7 +52,7 @@ class ERP5Catalog(Folder, Catalog):
 
   meta_type = "ERP5 Catalog"
   portal_type = 'Catalog'
-  allowed_types = ()
+  allowed_types = ('Python Script',)
   #TODO(low priority): Add an icon to display at ERP5 Zope interface
   icon = None
   # Activate isRADContent cause we need to generate accessors and default values