wait/notifyAll like in Java

[Frank Benoit (keinfarbton)]

> 2) Ben Hinkle has translated this package into D;

I found this lib, in an old version of mango.
In mango/locks/LockImpl.d the AbstractLock class implements the
wait/notify and the queue for waiting threads. That is probably on part
of what I need.

The other part is to bring together the D monitor with this lock.

Thanks for the hint.