Economy Dependency Graph Tool for orphaned Item detection and reference chain

I could not find this suggestion, so I figure I'd add...

Humans can be sloppy at cleaning up after themselves, sometimes.... making items/bundles/containers/droptables and then not using them anywhere.

It would be nice if we had an easy way of...

1. Detecting orphaned items/bundles/containers/droptables as candidates for deletion
2. Showing a dependency graph for any item/bundle/container/droptable to make it easier to track down a chain of references