Port -tg-'s port of /vg/'s smoothwall.

This commit ports -tg-'s port of the /vg/ smoothwall system. An important
thing to note is that we have extra code on top of the -tg- port to make
it work at all, and therefore, it may not be as efficent.

code/game/objects/effects/aliens.dm

@@ -21,8 +21,10 @@
 	density = 1
 	opacity = 1
 	anchored = 1
+	canSmoothWith = list(/obj/structure/alien/resin)
 	var/health = 200
 	var/resintype = null
+
 /obj/structure/alien/resin/New(location)
 	relativewall_neighbours()
 	..()
@@ -46,8 +48,8 @@
 	resintype = "wall"
 
 /obj/structure/alien/resin/wall/New()
-	relativewall_neighbours()
 	..()
+	relativewall_neighbours()
 
 /obj/structure/alien/resin/wall/shadowling //For chrysalis
 	name = "chrysalis wall"