Delete aggregation per regional zone (export/local) feature because it's not enough flexible (for example, if you fix the region of a third party, you need to regenerate the Closing Balance).

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@7631 20353a03-c40f-0410-a6d1-a30d3c3de9de