MFreeQueue [FirstQueue.w[,LastQueue.w]] ; Free a Queue, a range of queues, or all queues

Frees a specific, all or a range of previously-created queues. If the
parameters are omitted it will free all created chunky Queue objects.
If you specifiy a second parameter a range of queues willbe freed. When freed,
a Queue will be `killed' and the memory for the Queue items freed so the Queue
is effectively empty. If the specified Queues don't exist it will report an
error, but will not report an error when freeing all Queues.