2 jmod RFEs

[Jonathan Gibbons]

With classpaths, it is reasonably easy to determine if a class is on the 
classpath.  In the extreme case, I can write myself a script to do it.

With modules, it is not so easy.

It would help to have the following two queries available:

-- which module(s) contains a specified class?
-- if I were to "require" a specific module, would a specified class be 
visible?

-- Jon