Merge pull request #4613 from Neerti/1/21/2018_there_is_no_ceiling

Adds Missing Ceiling Overlay + Fixes Space on Roof

code/modules/clothing/glasses/glasses.dm

@@ -70,7 +70,7 @@ BLIND     // can't see anything
 	origin_tech = list(TECH_MAGNET = 2, TECH_ENGINEERING = 2)
 	toggleable = 1
 	vision_flags = SEE_TURFS
-	enables_planes = (VIS_FULLBRIGHT)
+	enables_planes = list(VIS_FULLBRIGHT, VIS_MESONS)
 
 /obj/item/clothing/glasses/meson/New()
 	..()

code/modules/mob/mob_planes.dm

@@ -33,6 +33,8 @@
 	plane_masters[VIS_D_COLORBLIND] = new /obj/screen/plane_master/colorblindness					//Colorblindness (affects world)
 	plane_masters[VIS_D_COLORBLINDI]= new /obj/screen/plane_master/colorblindness/items 			//Colorblindness (items in HUD, subplane of above, don't toggle)
 
+	plane_masters[VIS_MESONS]		= new /obj/screen/plane_master{plane = PLANE_MESONS} 			//Meson-specific things like open ceilings.
+
 	..()
 
 /datum/plane_holder/Destroy()

code/modules/multiz/turf.dm

@@ -52,6 +52,7 @@
 	below = GetBelow(src)
 	turf_changed_event.register(below, src, /turf/simulated/open/update_icon)
 	levelupdate()
+	below.update_icon() // So the 'ceiling-less' overlay gets added.
 	for(var/atom/movable/A in src)
 		A.fall()
 	OS_controller.add_turf(src, 1)