More bugfixes!

-Fixes an issue with protolathes being able to be loaded forever
-Adds 3 pairs of Mesons to the EngiVend to compensate for all the missing engineering lockers
-Changed the spawn order for lasertag closets (So you can actually click the different items)
-Makes lasertag turrets and ED-209's much more efficient, prevents them from shooting at downed people, they don't target 'criminals', they cannot be used by the opposing team, most options are auto-magically set on creation and the buttons to change them are disabled (Everything but the on/off and the patrol for ED's, for now), and when emagged, they fire 'omnitag' bolts (Stuns everyone with a vest)
-Gave blue lasertag bolts their own sprite to match the style of the red tags
-Nerfed the amount of radiation from the radium and uranium reagents

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@3866 316c924e-a436-60f5-8080-3fe189b3f50e

code/modules/research/protolathe.dm

@@ -126,17 +126,21 @@ Note: Must be placed west/left of and R&D console to function.
 			return 1
 		if (stat)
 			return 1
-		if (TotalMaterials() + 3750 > max_material_storage)
-			user << "\red The protolathe's material bin is full. Please remove material before adding more."
-			return 1
+		if(istype(O,/obj/item/stack/sheet))
+			var/obj/item/stack/sheet/S = O
+			if (TotalMaterials() + S.perunit > max_material_storage)
+				user << "\red The protolathe's material bin is full. Please remove material before adding more."
+				return 1
 
 		var/obj/item/stack/sheet/stack = O
-		var/amount = round(input("How many sheets do you want to add?") as num)
-		if(amount < 0)
+		var/amount = round(input("How many sheets do you want to add?") as num)//No decimals
+		if(amount < 0)//No negative numbers
 			amount = 0
 		if(amount == 0)
 			return
 		if(amount > stack.amount)
+			amount = stack.amount
+		if(max_material_storage - TotalMaterials() < (amount*stack.perunit))//Can't overfill
 			amount = min(stack.amount, round((max_material_storage-TotalMaterials())/stack.perunit))
 
 		src.overlays += "protolathe_[stack.name]"