Concentrate all imports of addWorkflowFactory to a location under our control. For CMF 2.x we will emulate this function by creating actual Zope2 Factories for our workflows.

git-svn-id: https://svn.erp5.org/repos/public/erp5/sandbox/portal_types@29477 20353a03-c40f-0410-a6d1-a30d3c3de9de