to portal type classes if possible.

It involves for instance Delivery Builders, that are stored
as Products.ERP5.Document.SimulatedDeliveryBuilder, and are
out of reach of our automatic migration from ERP5Type.Document...


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@42958 20353a03-c40f-0410-a6d1-a30d3c3de9de