This returns the complete tree of extended dependencies of a single installed package.
For instance, a real-world example. package SOAP depends on Mail_Mime, HTTP_Request, Net_URL, Net_DIME. package HTTP_Request depends on Net_URL, Net_Socket. This method will return an array
similar to:
Note that this should not be relied upon for exact dependencies. In the example above, the
returned dependency will be that of HTTP_Request upon Net_URL, which is stricter than SOAP's
dependency upon Net_URL. In other words, if there are two similar dependencies, the last
one encountered will be returned.