Fixed and cleaned up ZAS. Added some better sanity to explosion locations.

ZAS procs are now more standardized, needs more comments though.
Connections between zones now self-manage themselves, adjusting things if/when the turfs they are on change zones. (The check for this is very efficient and fast, but a bit hard to read codewise)
Zone share percent set to 4.  Seems to work well.

code/modules/mob/living/carbon/human/death.dm

@@ -65,7 +65,7 @@
 		//For ninjas exploding when they die./N
 		if (istype(wear_suit, /obj/item/clothing/suit/space/space_ninja)&&wear_suit:s_initialized)
 			src << browse(null, "window=spideros")//Just in case.
-			var/location = loc
+			var/turf/location = get_turf(src)
 			explosion(location, 1, 2, 3, 4)
 
 		canmove = 0

code/modules/mob/living/carbon/metroid/death.dm

@@ -11,7 +11,7 @@
 				if (ghost.client)
 					ghost.client.eye = ghost
 
-			explosion(src.loc, -1,-1,3,12)
+			explosion(get_turf(src), -1,-1,3,12)
 			sleep(2)
 			del(src)
 		else

code/modules/mob/living/silicon/ai/death.dm

@@ -39,7 +39,7 @@
 
 	if(explosive)
 		spawn(10)
-			explosion(src.loc, 3, 6, 12, 15)
+			explosion(get_turf(src), 3, 6, 12, 15)
 
 	for(var/obj/machinery/ai_status_display/O in world) //change status
 		spawn( 0 )

code/modules/mob/living/silicon/decoy/death.dm

@@ -2,7 +2,7 @@
 	src.stat = 2
 	src.icon_state = "ai-crash"
 	spawn(10)
-		explosion(src.loc, 3, 6, 12, 15)
+		explosion(get_turf(src), 3, 6, 12, 15)
 
 	for(var/obj/machinery/ai_status_display/O in world) //change status
 		spawn( 0 )