Added Energy Watcher API

Added Event to Recalculate Channel Requirements for a Node.
Level Emitter can now output redstone based on network energy levels.
Level Emitter's entry field can now hold longs ( text box supports up o trillions )

me/energy/EnergyThreshold.java

@@ -0,0 +1,35 @@
+package appeng.me.energy;
+
+import appeng.api.networking.energy.IEnergyWatcher;
+import appeng.util.ItemSorters;
+
+public class EnergyThreshold implements Comparable<EnergyThreshold>
+{
+
+	public final double Limit;
+	public final IEnergyWatcher watcher;
+	final int hash;
+
+	public EnergyThreshold(double lim, IEnergyWatcher wat) {
+		Limit = lim;
+		watcher = wat;
+
+		if ( watcher != null )
+			hash = watcher.hashCode() ^ ((Double) lim).hashCode();
+		else
+			hash = ((Double) lim).hashCode();
+	}
+
+	@Override
+	public int hashCode()
+	{
+		return hash;
+	}
+
+	@Override
+	public int compareTo(EnergyThreshold o)
+	{
+		return ItemSorters.comparDouble( Limit, o.Limit );
+	}
+
+}