I removed lino and lino_xl from the  requirements.stable.txt in `book`.  Which means that we are "forced" to publish a new release on PyPI whenever there is some change in one of these packages required by an application.  Just to increase our consciousness of the difference between the "framework" and the "applications".  Our new co-operation directives say that customers don't pay for maintenance of the core (unless it "more efficient" to implement in the core).