Deprecating unkown liquid type

This was a cool idea to prevent NPE errors in the api however its
leading to other issues. This could be with how i was using it but it
just needs too go.

src/minecraft/hydraulic/core/liquidNetwork/LiquidHandler.java

@@ -23,6 +23,7 @@ public class LiquidHandler
 	public static LiquidData steam;
 	public static LiquidData water;
 	public static LiquidData lava;
+	@Deprecated
 	public static LiquidData unkown;
 	public static LiquidData waste;
 	public static LiquidData milk;