Given the name of a design, returns a "spec" for the library from which it came. If the design was not already loaded, this function tries to load it. If the design is successfully loaded, returns a list containing one element, the library name. If the design cannot be loaded or found, returns NoValue.
In a future release, when hierarchical libraries are supported, this list will contain more data. Attempting to load the design is subject to change in the future.