- get the value here instead of getting it from the renderer
- add as_string parameter on all render_od* call because by default string is
  returned and here we need a node
- add _recursiveGetAttributeDict method. It's used to build a dict containing
  all attributes of each nodes
- _recursiveApplyAttributeDict can be used to apply a dict build by
  _recursiveGetAttributeDict to a node

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31497 20353a03-c40f-0410-a6d1-a30d3c3de9de