* Implement an active queue management scheme on the TCP transports,
dropping messages probabalistically as the queue fills up. The
estimated queue capacity is determined by the rate at which messages
have been sent to the peer (averaged at 1, 5, and 60m periods). As
we exceed 1/2 of the estimated capacity, we drop messages throughout
the queue probabalistically with regards to their size. This is based
on RFC 2309's RED, with the minimum threshold set to 1/2 the
estimated connection capacity. We may want to consider using a send
rate and queue size measured across all connections, to deal with our
own local bandwidth saturation, but we'll try the per-con metrics first.
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