Remove unused system/update controllers

         except web.BadRequest:
             return app.view.search.index()
         return app.view.search.results(query, app.model.search(query))
-
-
-# XXX @app.control("system")
-# XXX class System:
-# XXX     """System code."""
-# XXX
-# XXX     def get(self):
-# XXX         """"""
-# XXX         return app.view.system(web.tx.app)
-# XXX
-# XXX
-# XXX @app.control("system/update")
-# XXX class SystemUpdate:
-# XXX     """Update the system."""
-# XXX
-# XXX     def post(self):
-# XXX         """"""
-# XXX         web.enqueue(update_system)
-# XXX         return "update has been started"