message: log rejection serial block height
diff: @@ -1011,9 +1011,9 @@ bool ContextualCheckZerocoinSpendNoSerialCheck(const CTransaction& tx, const Coi
  } catch (libzerocoin::InvalidSerialException &e) {
  // Check if we are in the range of the attack
  if(!isBlockBetweenFakeSerialAttackRange(pindex->nHeight))
  - return error("%s: Invalid serial detected, txid %s\n", __func__, tx.GetHash().GetHex());
  + return error("%s: Invalid serial detected, txid %s, in block %d\n", __func__, tx.GetHash().GetHex(), pindex->nHeight);
  else
  - LogPrintf("%s: Invalid serial detected within range\n", __func__);
  + LogPrintf("%s: Invalid serial detected within range in block %d\n", __func__, pindex->nHeight);
  }
  libzerocoin::SpendType expectedType = libzerocoin::SpendType::SPEND;
  