Document little quirk with storage graph

src/main/kotlin/ru/dbotthepony/mc/otm/graph/storage/BasicStorageGraphNode.kt

@@ -30,7 +30,7 @@ open class BasicStorageGraphNode(private val energyDemander: IMatteryEnergyStora
 
 	override fun attachComponents(to: StorageNetworkGraph) {
 		if (energyDemander != null) {
-			if (!demandingEnergy && energyDemander.missingPower.isPositive) {
+			if (energyDemander.missingPower.isPositive) {
 				demandingEnergy = true
 				to.powerDemandingNodes.add(energyDemander)
 			}

src/main/kotlin/ru/dbotthepony/mc/otm/graph/storage/IStorageGraphNode.kt

@@ -11,6 +11,9 @@ interface IStorageGraphNode {
 
 	/**
 	 * Called by storage graph on node being detached from it
+	 *
+	 * This is NOT called when graph is being destroyed (e.g. even by merging
+	 * with another graph).
 	 */
 	fun removeComponents(from: StorageNetworkGraph)