Area fixes (#2875)

changes:

Fixes copy_contents_to not working.
Fixes elevators attempting to spawn roofs when it didn't really make sense.
Minor efficiency tweaks in move_contents_to and elevators.

code/modules/turbolift/turbolift_areas.dm

@@ -5,6 +5,7 @@
 	requires_power = 0
 	station_area = 1
 	sound_env = SMALL_ENCLOSED
+	no_roof = TRUE
 
 	var/lift_floor_label = null
 	var/lift_floor_name = null

code/modules/turbolift/turbolift_map.dm

@@ -128,7 +128,7 @@
 		for(var/i = 1, i < uz, i++)
 			lift.floors += null // This silly hack allows lifts to not start on the first zlevel
 
-	for(var/cz = uz;cz<=ez;cz++)
+	for(var/cz = uz to ez)
 
 		var/datum/turbolift_floor/cfloor = new()
 		lift.floors += cfloor