* Add file fckstyles.xml to have one more style : "Python code" wich improve python code blocks displaying.
* Modify erp5_editor.css file to display this new div class in a nice way.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@23780 20353a03-c40f-0410-a6d1-a30d3c3de9de