- Change typologie of parameters when they are mandatory (named parameters =>...

- Change typologie of parameters when they are mandatory (named parameters => positional parameters)
- return element_tree is useless, as the object the same
- code cleanup & word-wrapping


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@31056 20353a03-c40f-0410-a6d1-a30d3c3de9de