Experimental tweak, I'll revert this if everyone hates it but for now I want to see how things will be if airlocks use the environmental power channel.

-Changed airlocks to use the environmental power channel.
-Changed all airlock controlling devices to use the environmental power channel.
-Changed shutters to use the environmental power channel.
-Changed pipe meters to use the environmental power channel.



git-svn-id: http://tgstation13.googlecode.com/svn/trunk@4784 316c924e-a436-60f5-8080-3fe189b3f50e

code/ATMOSPHERICS/components/unary/vent_pump.dm

@@ -8,7 +8,6 @@
 	level = 1
 	var/area_uid
 	var/id_tag = null
-	power_channel = ENVIRON
 
 	var/on = 0
 	var/pump_direction = 1 //0 = siphoning, 1 = releasing

code/ATMOSPHERICS/components/unary/vent_scrubber.dm

@@ -226,7 +226,7 @@
 		return
 
 	power_change()
-		if(powered(ENVIRON))
+		if(powered(power_channel))
 			stat &= ~NOPOWER
 		else
 			stat |= NOPOWER