* modify display of variation category in Stock tabs for Orders( it was displaying relative_urls instead of titles of variation categories)
*remove TALES expression for quantity_unit in OrderLine_view(it was not enabled when there was variation defined for the resource)
*remove TALES expression for quantity_unit in Order_view(it was not enabled when there was variation defined for the resource)
*add new column to define quantity_unit defined in order(because quanty_unit defined in order can be different from quantity_unit used in stock)

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@26464 20353a03-c40f-0410-a6d1-a30d3c3de9de