* setData and setFile can be used
 * text_format and content_type are similar
   so delete this property from TextDocument PropertySheet
 * Delete ad hoc support for DAV control 


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@35241 20353a03-c40f-0410-a6d1-a30d3c3de9de