-Made wizard require at least 20 players, instead of any. This is hopefully stop a low pop wizard from killing the whole crew and not calling the shuttle until an admin intervenes.

-Made nuke ops require at least 20 players. I did this because 15 wasn't low enough and it is a 5 heavily manned organized team vs 10 crew members who are just going along their own business.
-Made the spells only target living mobs. This was because the spells were listing the AI eye as a target.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@4573 316c924e-a436-60f5-8080-3fe189b3f50e

code/datums/spell.dm

@@ -229,7 +229,7 @@ var/list/spells = typesof(/obj/effect/proc_holder/spell) //needed for the badmin
 
 	switch(max_targets)
 		if(0) //unlimited
-			for(var/mob/target in view_or_range(range, user, selection_type))
+			for(var/mob/living/target in view_or_range(range, user, selection_type))
 				targets += target
 		if(1) //single target can be picked
 			if(range < 0)
@@ -241,7 +241,7 @@ var/list/spells = typesof(/obj/effect/proc_holder/spell) //needed for the badmin
 				targets += input("Choose the target for the spell.", "Targeting") as mob in possible_targets
 		else
 			var/list/possible_targets = list()
-			for(var/mob/target in view_or_range(range, user, selection_type))
+			for(var/mob/living/target in view_or_range(range, user, selection_type))
 				possible_targets += target
 			for(var/i=1,i<=max_targets,i++)
 				if(!possible_targets.len)