- set 'View' permission to index_html method as well as r26362
 - when just call FormPrintout from Python script or python code,
   must not set RESPONSE headers



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@26363 20353a03-c40f-0410-a6d1-a30d3c3de9de