* use DEFAULT_QUALITY constant
  * Postpone the test off relevance conversion parameters in order to check
    if resizing is not needed to fit display ratio.
    If test succeed then call convert, otherwise return raw image (getData).
  * remove _getDisplayPhoto and merge is code inside _makeDisplayPhoto
    because this method is called from only one statement and factorisation
    is null



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@35240 20353a03-c40f-0410-a6d1-a30d3c3de9de