Fixing distributed references to zone_management.
Fixing i18n references to zone_management.
Set __package__ variable so imported settings files can use it.
Set proper package strings by using the __package__ variable.
Avoid using distributed-only settings in function headers.
Remove references to defunct central_server_test decorator.
Generalize control_panel to work for central server.
Separate central/org manipulation cleanly from control_panel/zone manipulation.