Since the TimedWeightedPriorityMessageQueue.add()
was disabled by jrandom in UDPTransport.java
on 2006-02-19, and the choke/unchoke was disabled at the same time,
all of TWPMQ is pointless, so just do this for now.
It appears from his comments that it was a lock contention issue,
so perhaps TWPMQ can be converted to concurrent and re-enabled.