Back out previous revision (-j); linkmap is now generated on
experimental nodes from the topomap. "static" routing now implies ddijk routing, but since old images won't have any of that support, we still have to generate routes and store them in the DB. However, only doing this when the number of nodes in the experiment is less than 250; otherwise print a warning and refuse to generate the routes. Also add "static-old" so that people can request/force old static routing no matter how big the experiment.