Allow other roles than Owner to be catalogued in a monovalued column.
Romain Courteaud authored
Monovalued column only index user ID, and no security group.
If some security groups are assigned to such role, they are still catalogued in
the roles_and_users table.


git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@25449 20353a03-c40f-0410-a6d1-a30d3c3de9de
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