- change the way the image is replaced : use the image "as she is display", so
Fabien Morin authored
  if the image is display as a thumbnail, the image will be added in the odg
  document as thumbnail size/quality
- _replaceImage method is not required anymore, remove it
- update methods signatures to be consistent with other render_*
- if there is some height and width in the node attribute (because of
  attr_dict), try to make the image smaller or equal to this dimentions, and
  keep proportion

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31496 20353a03-c40f-0410-a6d1-a30d3c3de9de
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