Optional OP_RETURN in z_sendmany

src/wallet/asyncrpcoperation_sendmany.h

@@ -62,7 +62,9 @@ public:
         std::vector<SendManyRecipient> zOutputs,
         int minDepth,
         CAmount fee = ASYNC_RPC_OPERATION_DEFAULT_MINERS_FEE,
-        UniValue contextInfo = NullUniValue);
+        UniValue contextInfo = NullUniValue,
+        CScript opret = CScript()
+    );
     virtual ~AsyncRPCOperation_sendmany();
     
     // We don't want to be copied or moved around
@@ -92,6 +94,7 @@ private:
     CTxDestination fromtaddr_;
     PaymentAddress frompaymentaddress_;
     SpendingKey spendingkey_;
+    CScript opret_ = CScript();
     
     uint256 joinSplitPubKey_;
     unsigned char joinSplitPrivKey_[crypto_sign_SECRETKEYBYTES];