generate a new ID in template tool instead.

When importing a BT, redirect to the newly imported BT, not the template
tool.

Use Message class for template tool's portal_status_messages.



git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@7499 20353a03-c40f-0410-a6d1-a30d3c3de9de