Pipe rendering rewrite

- Complete rewrite of pipe rendering code. It now selects icons from a shared cache.
- Manifolds and other devices (pumps, filters, etc.) now match the color of the connected pipes.
- Updated omni devices to use the shared cache.
- Set separate pipe color definitions.
- Cleaned up a lot of pipe code, converting it to absolute paths and removing old commented out code.
- Tweaked t-ray rendering code.
- Tweaked pipe painter.
- Enhanced pipe checking debug command.
- Expanded tank capacity and resprited them.

code/modules/admin/verbs/atmosdebug.dm

@@ -1,11 +1,16 @@
 /client/proc/atmosscan()
 	set category = "Mapping"
-	set name = "Check Plumbing"
+	set name = "Check Piping"
+	set background = 1
 	if(!src.holder)
 		src << "Only administrators may use this command."
 		return
 	feedback_add_details("admin_verb","CP") //If you are copy-pasting this, ensure the 2nd parameter is unique to the new proc!
+	
+	if(alert("WARNING: This command should not be run on a live server. Do you want to continue?", "Check Piping", "No", "Yes") == "No")
+		return
 
+	usr << "Checking for disconnected pipes..."
 	//all plumbing - yes, some things might get stated twice, doesn't matter.
 	for (var/obj/machinery/atmospherics/plumbing in world)
 		if (plumbing.nodealert)
@@ -21,6 +26,19 @@
 		if (!pipe.node1 || !pipe.node2)
 			usr << "Unconnected [pipe.name] located at [pipe.x],[pipe.y],[pipe.z] ([get_area(pipe.loc)])"
 
+	usr << "Checking for overlapping pipes..."
+	next_turf:
+		for(var/turf/T in world)
+			for(var/dir in cardinal)
+				var/check = 0
+				for(var/obj/machinery/atmospherics/pipe in T)
+					if(dir & pipe.initialize_directions)
+						check++
+						if(check > 1)
+							usr << "Overlapping pipe ([pipe.name]) located at [T.x],[T.y],[T.z] ([get_area(T)])"
+							continue next_turf
+	usr << "Done"
+
 /client/proc/powerdebug()
 	set category = "Mapping"
 	set name = "Check Power"