conexus 0.3.0 released

In this release the threading model has been simplified and restructured to eliminate the use of pthread_cancel() and use Glibmm's Thread and Mutex classes. The UDPPoset class is also new and provides for partially ordered UDP unicast transmission groups. The PacketCapture class has been removed since its dependency on pcap no longer fits with the threading model, and a similar LL::Packet class fulfills most basic IP layer capturing. There are also a few bug fixes, some other minor enhancements and a little more documentation.