revised Nine Ball game

[Jon]

I really liked Jim Hurley's Nine Ball game, so I revised it a bit and 
uploaded it to my user space. 

I moved the New menu entry to the main level, so that it was easier to use;
added an Undo feature so you can re-try a shot you missed; and
added the ability to turn the sound effects off, in case you're 
listening to music while playing.

I hope Jim approves of these revisions!

:)

Jon