Modify scheduler to fill empty queues

[slogan621]

The scheduler needs to be modified so that if it detects an empty queue, it scans other queues for patients who have that class of station in their routing slips, pull the patient out of the queue, and insert it into the empty queue. It needs to do this without breaking the scheduling priorities of the queues. For example, if surgery screening is empty and there is a patient in the ENT queue that has surgery screening in the routing slip, the patient can only be moved to surgery screening if ENT is not at a higher priority (or there is not a dependency on surgery screening that ENT be visited first).

[slogan621]

Likely won't fix, since we've deprecated the scheduler functionality.