* Thread synchronization, mutexes on all shared lists
* Tracks outgoing reliable packets and incoming ACKs (PacketAcks and appended ACKs)
* Can send independent PacketAck datagrams or append ACKs to outgoing packets
* Simplified the Packet class to use a byte[] array for data instead of an ArrayList. Now requires a packet length during initialization
git-svn-id: http://libopenmetaverse.googlecode.com/svn/trunk@20 52acb1d6-8a22-11de-b505-999d5b087335