add rct to the protocol

It is not yet constrained to a fork, so don't use on the real network
or you'll be orphaned or rejected.

src/blockchain_db/lmdb/db_lmdb.cpp

@@ -861,6 +861,8 @@ void BlockchainLMDB::remove_tx_outputs(const uint64_t tx_id, const transaction&
   {
     const tx_out tx_output = tx.vout[i-1];
     remove_output(tx_output.amount, amount_output_indices[i-1]);
+    if (tx_output.amount == 0)
+      remove_rct_commitment(amount_output_indices[i-1]);
   }
 }