* create erp5_item_trade for Trade related Forms and script
* Move forms and scripts in it.
* create Base_viewTradeFieldLibrary for specific fields.
* Enhance proxyfication of erp5_item's Forms

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@39925 20353a03-c40f-0410-a6d1-a30d3c3de9de