Partial fixes for #1956: avoid using generic inner function names in decorators.
Refactoring org_management javascript code to a separate file.
Set up ajax-based org and zone deletions.
Code cleanup.
Move delete_zone code to central app (where it belongs, it depends on `Organization`!)
Method for simple specification of back-end/front-end AJAX interaction
Migrate facility app to use new method for back-end / front-end interaction.