- providing pre-mapped column to catalog is the only way to make a mapping explicit when mapping fails because of ambiguous choice
   -> it must not be discouraged
 - having in catalog configuration pre-mapped columns (sql_search_result_keys) is currently unavoidable
   -> it must not trigger a warning


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@25885 20353a03-c40f-0410-a6d1-a30d3c3de9de