Fix document ingestion so that no workflow method is called when the transition doesn't exist for the current state.
This is mainly done by removing 'edit' transition on processing_workflow, to prevent duplicate processing of ingestion.
Reuse edit_workflow for all portal types with processing_status_workflow and update computation of revision (Document.getRevision).


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@27896 20353a03-c40f-0410-a6d1-a30d3c3de9de