res that it exports the settings of one of its
own dependencies, those dependencies whose settings are "passed through"
are added to the list.  As new items are added to the list, they too will
be processed, so it is possible to import settings through multiple levels
of dependencies.

This method is not terribly useful on its own, it depends on being
"primed" with a list of direct dependencies such as one provided by
DirectDependencies.  DirectAndImportedDependencies is intended to be the
public entry point.
r