Currently removed all instances of makepowernets() and update_network() (Update network just called makepowernets()) from cable.dm.
All actings regarding cables went from 0.5 to <0.08 per call.
-Added a verb in the debug panel called Make Powernets. This calls makepowernets().
git-svn-id: http://tgstation13.googlecode.com/svn/trunk@1729 316c924e-a436-60f5-8080-3fe189b3f50e