Removal of manual updating of state objects

* You'll only ever need to update the state by calling Update. Update
  will take care of the updating of it's child state objects.

ethchain/state_manager.go

@@ -181,7 +181,6 @@ func (sm *StateManager) ProcessBlock(state *State, parent, block *Block, dontRea
 	coinbase.SetGasPool(block.CalcGasLimit(parent))
 
 	// Process the transactions on to current block
-	//sm.ApplyTransactions(block.Coinbase, state, parent, block.Transactions())
 	sm.ProcessTransactions(coinbase, state, block, parent, block.Transactions())
 
 	// Block validation
@@ -197,6 +196,9 @@ func (sm *StateManager) ProcessBlock(state *State, parent, block *Block, dontRea
 		return err
 	}
 
+	// Update the state with pending changes
+	state.Update()
+
 	if !block.State().Cmp(state) {
 		return fmt.Errorf("Invalid merkle root.\nrec: %x\nis:  %x", block.State().trie.Root, state.trie.Root)
 	}