Minor cosmetic changes. Also added support for optimised role indexing in the...

Minor cosmetic changes. Also added support for optimised role indexing in the catalog. (ex. owner). This is required in particular for sites which need to track owner of documents in an efficient way.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@13039 20353a03-c40f-0410-a6d1-a30d3c3de9de