non-editable fields.
Test LinesField fields. It turns out that non-editable LinesField are not
supporting extra/CSS attributes at the moment when used in listboxes


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@33625 20353a03-c40f-0410-a6d1-a30d3c3de9de