in trade model path view don't use terms for trade but use technical terms (like "Source Section"), because we cannot use trade term here as a trade model path can be use to generate movements outside of trade business field. Also allow to select any node, not only persons / organisations

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@44384 20353a03-c40f-0410-a6d1-a30d3c3de9de