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plone.app.portlets to-do
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  Decisions
  
    o May need a way to filter addable portlets by permission (e.g. some
        portlets are only available to some groups of users)
        
    o Category mappings are created on-the-fly in the namespace traversal
      adapters, which many not be ideal (even though these are protected by
      ManagePortal)
      
        - may be sufficient to create when the management views are invoked