If you are upgrading from a EML051 instance and you have installed
custom modules then the upgrade script doesn't take this into
account and odd things can occur in your sidebar.
We need to analyse how to handle this part of the upgrade and
perhaps how to handle the versioning of modules in the future.
At the very least in 1.0 we should delete all non-standard modules
from the DB upon upgrade and force the user to reinstall.