addresses minor issues:

isobj changed to explicit istype /obj
added extra frames to blast door animation so it doesn't restart
removed ZAS vars from /door/, added missing vars to door subtypes
adjusted layers of doors, removed layer varedits on maps

code/game/objects/obj_defense.dm

@@ -44,7 +44,7 @@
 	var/tforce = 0
 	if(ismob(AM))
 		tforce = 10
-	else if(isobj(AM))
+	else if(istype(AM, /obj))
 		var/obj/O = AM
 		tforce = O.throwforce
 	take_damage(tforce, BRUTE, "melee", 1, get_dir(src, AM))

code/game/objects/structures/grille.dm

@@ -277,7 +277,7 @@
 	..()
 
 /obj/structure/grille/hitby(atom/movable/AM)
-	if(isobj(AM))
+	if(istype(AM, /obj))
 		if(prob(50) && anchored && !broken)
 			var/turf/T = get_turf(src)
 			var/obj/structure/cable/C = T.get_cable_node()