Except the CUSTOMIZATION variable.
Setting variables on a specific deployment is now possible in
/etc/docbow/settings.py and /etc/docbow/settings.d/*.py files.
These settings are the last being loaded and therefore take
precedence over docbow_projects.settings.
docbow_project/pw/setttings.py and docbow_project/pfwb/setttings.py are kept
as legacy documentation but are not loaded any more.