docs: def removeProductFrom(self, userstore):
          """
          Uninstall all the powerups this product references and remove
          the Installation item from the user's store. Doesn't remove
          the actual powerups currently, but /should/ reactivate them if
          this product is reinstalled.
          """
          def uninstall():
              #this is probably highly insufficient, but i don't know the
              #requirements
              i = userstore.findFirst(Installation,
                                      Installation.types == self.types)
              i.uninstall()
              i.deleteFromStore()
          userstore.transact(uninstall)