-Changed the powernet nodes list to be a dictionary list (associative list, hashtable, etc..)

-Added a solars_list. The sun will use this list instead of the machines list. I made a proc which decided on whether to use this list or the powernet nodes list depending on what is smallest. I replaced some loops to use this proc.
-The sun will reference this list for debugging purposes. The sun will also remove solar equipment in the list which are not connected to a powernet.
-Cut down on some duplicated code.
-Fixed an issue with solar panels not updating their direction correctly.
-Changed the proc updateicon()'s name to update_icon()

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@5418 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/power/power.dm

@@ -99,7 +99,7 @@
 
 	for(var/obj/machinery/power/M in machines)
 		if(!M.powernet)	continue	// APCs have powernet=0 so they don't count as network nodes directly
-		M.powernet.nodes += M
+		M.powernet.nodes[M] = M
 
 
 // returns a list of all power-related objects (nodes, cable, junctions) in turf,
@@ -274,7 +274,7 @@
 			if(Node && !Node.powernet)
 				Node.powernet = PN
 				nodes.Cut(i,i+1)
-				PN.nodes += Node
+				PN.nodes[Node] = Node
 				continue
 			i++
 
@@ -364,7 +364,7 @@
 		var/obj/machinery/power/Node = net2.nodes[i]
 		if(Node)
 			Node.powernet = net1
-			net1.nodes += Node
+			net1.nodes[Node] = Node
 
 	for(var/i=1,i<=net2.cables.len,i++)
 		var/obj/structure/cable/Cable = net2.cables[i]
@@ -382,7 +382,7 @@
 	if(!C || !C.powernet)	return
 //	makepowernets() //TODO: find fast way	//EWWWW what are you doing!?
 	powernet = C.powernet
-	powernet.nodes += src
+	powernet.nodes[src] = src
 
 /obj/machinery/power/proc/disconnect_from_network()
 	if(!powernet)	return