Rewrote about half of it. Now much more general and generates topology
from wires table. This is the first step to supporting more general topologies. There a couple testbed specific settings that are at the top of the file. Things such as the speed of our switch interfaces (since we have no data on those interfaces in the DB), what type of switches we have, and the fact that we have APCs that are in the nodes table but can't be used as nodes. This does generate slightly larger ptop files than the old version. All of the extra is isolated nodes so it only adds negligable runtime to assign.