OpenACS

- add clear button for clearning files/images added added in a

  prevision revision (unless flag "sticky" is used)

- tie revisions of the FormPage/WorkflowInstance with the revision

  of the uploaded file (the content of the formfield is now a

  list of attribute value pairs that might contain a revision_id)

- allow multiple uploads of files with the same name (distinguish with

  reusing old content)

- caveat: export should strip the revision_id from the content

  of the form-field.

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