Powernets

Moved powernet datum definition to powernet.dm
Improved APC load balancing.
Updated SMES charging to work better with new APC/powernet code.

code/datums/mixed.dm

@@ -30,20 +30,5 @@
 
 
 
-/datum/powernet
-	var/list/cables = list()	// all cables & junctions
-	var/list/nodes = list()		// all APCs & sources
-
-	var/newload = 0
-	var/load = 0
-	var/newavail = 0
-	var/avail = 0
-	var/viewload = 0
-	var/number = 0
-	var/perapc = 0			// per-apc avilability
-	var/netexcess = 0
-
-
-
 /datum/debug
 	var/list/debuglist