Ports some fixes

code/__defines/_planes+layers.dm

@@ -68,6 +68,7 @@ What is the naming convention for planes or layers?
 
 // Obj planes
 #define OBJ_PLANE				-35
+	#define STAIRS_LAYER			2.5 // Layer for stairs
 	#define HIDING_LAYER			2.6 // Layer at which mobs hide to be under things like tables
 	#define DOOR_OPEN_LAYER			2.7 // Under all objects if opened. 2.7 due to tables being at 2.6
 	#define TABLE_LAYER				2.8 // Just under stuff that wants to be slightly below common objects.

code/modules/food/kitchen/gibber.dm

@@ -217,13 +217,13 @@
 
 	spawn(gib_time)
 
-		src.operating = 0
-		src.occupant.gib()
-		qdel(src.occupant)
+		operating = 0
+		occupant.gib()
+		occupant = null
 
 		playsound(src.loc, 'sound/effects/splat.ogg', 50, 1)
 		operating = 0
-		for (var/obj/item/thing in contents)
+		for (var/obj/thing in contents)
 			// There's a chance that the gibber will fail to destroy some evidence.
 			if(istype(thing,/obj/item/organ) && prob(80))
 				qdel(thing)

code/modules/multiz/movement.dm

@@ -336,6 +336,10 @@
 
 	// Detect if we made a silent landing.
 	if(locate(/obj/structure/stairs) in landing)
+		if(isliving(src))
+			var/mob/living/L = src
+			if(L.pulling)
+				L.pulling.forceMove(landing)
 		return 1
 	else
 		var/atom/A = find_fall_target(oldloc, landing)

code/modules/multiz/structures.dm

@@ -131,6 +131,7 @@
 	opacity = 0
 	anchored = 1
 	flags = ON_BORDER
+	layer = STAIRS_LAYER
 
 /obj/structure/stairs/Initialize()
 	. = ..()