message: [RPC] add mint block height to 'listmintedzerocoins'
diff: @@ -2592,6 +2592,7 @@ UniValue listmintedzerocoins(const UniValue& params, bool fHelp)
  " \"version\": n, (numeric) Zerocoin version number.\n"
  " \"zPIV ID\": \"xxx\", (string) Pubcoin in hex format.\n"
  " \"denomination\": n, (numeric) Coin denomination.\n"
  + " \"mint height\": n (numeric) Height of the block containing this mint.\n"
  " \"confirmations\": n (numeric) Number of confirmations.\n"
  " }\n"
  " ,..."
  @@ -2624,6 +2625,7 @@ UniValue listmintedzerocoins(const UniValue& params, bool fHelp)
  objMint.push_back(Pair("zPIV ID", m.hashPubcoin.GetHex())); // PubCoin
  int denom = libzerocoin::ZerocoinDenominationToInt(m.denom);
  objMint.push_back(Pair("denomination", denom)); // Denomination
  + objMint.push_back(Pair("mint height", m.nHeight)); // Mint Height
  int nConfirmations = (m.nHeight && nBestHeight > m.nHeight) ? nBestHeight - m.nHeight : 0;
  objMint.push_back(Pair("confirmations", nConfirmations)); // Confirmations
  // Push back mint object
  