* sliding windows w/ additive increase / multiplicitive decrease

* immediately send an ack on receiving a duplicate payload message
  (unless we've sent one within the last RTT)
* only adjust the RTT when there have been no resends
* added some (disabled) throttles - randomly injecting delays on
  received packets, as well as randomly dropping them
* logging

apps/streaming/java/src/net/i2p/client/streaming/PacketQueue.java

@@ -52,7 +52,7 @@ class PacketQueue {
                 packet.setTagsSent(tagsSent);
                 packet.incrementSends();
                 if (_log.shouldLog(Log.DEBUG)) {
-                    String msg = packet + " sent" + (tagsSent.size() > 0 
+                    String msg = "SEND " + packet + (tagsSent.size() > 0 
                                                      ? " with " + tagsSent.size() + " tags"
                                                      : "")
                                                      + " send # " + packet.getNumSends();