Fixed aliens spitting corrosive acid on objects that make no sense (singularities, shield walls, etc). Their corrosive acid should be reworked in the future, along with aliens in general.

Fixed the Syndie hull door computer so they cannot use it if the shuttle is not near SS13. Should still be operable by PDA regardless. Probably a good idea to change that computer entirely in the future.
Ripley files left unchecked since they don't compile.
Fixed an improper overlay pipe on the map, near Xenobiology.
Some WIP icon updates.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@682 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/mob/living/carbon/alien/humanoid/alien_powers.dm

@@ -294,9 +294,8 @@ Also perhaps only queens can do that?
 	set category = "Alien"
 
 	if(src.stat)
-		src << "You must be concious to do this"
+		src << "You must be concious to do this."
 		return
-
 	if(!istype(O, /obj))
 		return
 	/*if(range(O, src) > 1)
@@ -304,6 +303,9 @@ Also perhaps only queens can do that?
 		return*/
 	if(src.toxloss < 200)
 		src << "You don't have enough plasma."
+		return
+	if(istype(O, /obj/hud)||istype(O, /obj/machinery/shield)||istype(O, /obj/machinery/shieldwall)||istype(O, /obj/machinery/the_singularity)||istype(O, /obj/portal)||istype(O, /obj/rune)||istype(O, /obj/marker)||istype(O, /obj/bhole)||istype(O, /obj/livestock)||istype(O, /obj/creature)||istype(O, /obj/alien)||istype(O, /obj/machinery/containment_field))
+		src << "Can't destroy that object." //So you're not destroying black holes while you sizzle acid, dawg /N
 	else
 		src.toxloss -= 200
 		var/obj/alien/acid/A = new(O.loc)