Better graph viz of network

[bbengfort]

Here is the current status of graph viz:

1. There is a CommGraph that can be written to if the the appropriate configuration is set. This is a directed graph, meaning edges are not parallel and must be updated on each new message. This is then dumped to GraphML
2. There is a command that reads the GraphML and does some simple analysis to convert into a form that's easily visualized with Gephi. These images have already been created.

There are a few problems:

1. These graphs are static (can't animate over time)
2. The colors in the graphs are non-representative.
3. Information is incomplete

So to revise this we need to:

• change the digraph to a multigraph
• write out all messages as individual edges
• track the recv time along with sent time
• convert gephi to use dst as color not src
• ensure that nodes that get multiple colors work.