make BuildCraftEnergy reentrant

BuildCraftEnergy.patch

diff --git a/buildcraft/common/net/minecraft/src/BuildCraftEnergy.java b/buildcraft/common/net/minecraft/src/BuildCraftEnergy.java
index ba3440a..f515754 100755
--- a/buildcraft/common/net/minecraft/src/BuildCraftEnergy.java
+++ b/buildcraft/common/net/minecraft/src/BuildCraftEnergy.java
@@ -34,6 +34,7 @@ import net.minecraft.src.forge.MinecraftForge;
 import net.minecraft.src.forge.Property;
 
 public class BuildCraftEnergy {
+	private static boolean initialized = false;
 	
 	public final static int ENERGY_REMOVE_BLOCK = 25;
 	public final static int ENERGY_EXTRACT_ITEM = 2;
@@ -51,6 +52,15 @@ public class BuildCraftEnergy {
 	
 	public static void ModsLoaded () {
 		BuildCraftCore.initialize();
+		initialize();
+	}
+	
+	public static void initialize() {
+		if (initialized) {
+			return;
+		}
+		
+		initialized = true;
 		
 		Property engineId = BuildCraftCore.mainConfiguration
 		.getOrCreateBlockIdProperty("engine.id",