Add a new "archived" state available from "planned" state. It's identical to "canceled" state (and replaces it in the list of transitions available on "planned" state) but using a separate state name allows to trigger a different interraction workflow method if needed.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@19727 20353a03-c40f-0410-a6d1-a30d3c3de9de