Added comments so that others can understand what the classes are for.
UDP Network discovery is now functional. Other threads (in the same
computer) can be detected. A maximum of 16 processes can be found
(ranging from initial port to the next 15 inclusive).

A JList of the discovered hosts is displayed. The next step is to ask
all the detected hosts if the stage is available.
Leader is manually set. Port added to udp broadcast. Basework for
assigning numbers.