Upgraded conductor graph

This updates and cleans up the conductor graph. Funny how easy it is now, gateway graph was terribly confusing.

* Major cleanup, got rid of all unused rosgraph code
* Now listens to the conductor graph topic
* Shows all clients - pending, joining, uninvited, available, missing, blocking, busy and bad.
* Option for clustering by ip

Still some things to check though:

* Do tests for all the client states above
* Filtering options - probably we want to sometimes filter the noisy ones (like busy)
* View upgrades in case it gets confusing when a whole lot of clients are around.