remove unused category. Take care at the upgrade of this bt if you have existing datas, all categories removed in this commit will be removed at the bt upgrade if you accecpt everything.
I recommand to keep all of this categories and to expire them.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@29059 20353a03-c40f-0410-a6d1-a30d3c3de9de