Cross-reference information

Hi,

When studying a new project it would be often nice to see from which classes the current class is referenced. I propose that the following information could be included in the beginning of the class source page:

Inherited by: (list of classes that extend this class)

Constructed by: (list of classes that construct this class)

Referenced by: (list of classes that reference this class)

Constructs: (list of classes this class constructs)

Referenced: (list of classes this class references)

It would be also good to have some kind of notation which informs whether the listed class is in same package as the current class or not.