Kulla: JShell API ready for round two review

[Brian Goetz]

>> Would need to be a non-exported *package*.  Exports work at the
>> package granularity.
>
> Would it be OK just to hide it from the javadoc (don’t remember how
> to do that, but remember that there is a way)?

Better than nothing, but let's try to find a right place for it first.

If this is for the *tool* and not for the JShell API, shouldn't it go in 
the package with the tool?  It wouldn't be so out of place there.