Use VARBINARY type for group_id column in portal_ids table: as data comes from a dictionary, data can contain strings considered identical in VARCHAR interpretation, which would break clear_catalog action.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@21609 20353a03-c40f-0410-a6d1-a30d3c3de9de