message: correctly calculate minFee for multisig
diff: @@ -355,7 +355,7 @@ void MultisigDialog::on_transaction_textChanged()
  return;
  transactionSize += ui->inputs->count() * 73; // Future ECDSA signatures in DER format
  int64 fee = (int64 ) (ui->fee->text().toDouble() * COIN);
  - int64 minFee = MIN_TX_FEE * (1 + (int64) transactionSize / 1000);
  + int64 minFee = (int64)(transactionSize * (PERKB_TX_FEE / 1000));
  if(fee < minFee)
  {
  ui->fee->setStyleSheet("color:red;");
  @@ -493,7 +493,7 @@ void MultisigDialog::on_sendTransactionButton_clicked()
  // Check the fee
  int64 fee = (int64 ) (ui->fee->text().toDouble() * COIN);
  - int64 minFee = MIN_TX_FEE * (1 + (int64) transactionSize / 1000);
  + int64 minFee = (int64)(transactionSize * (PERKB_TX_FEE / 1000));
  if(fee < minFee)
  {
  QMessageBox::StandardButton ret = QMessageBox::question(this, tr("Confirm sending transaction"), tr("The fee of the transaction (%1 PPC) is smaller than the expected fee (%2 PPC). Do you want to send the transaction anyway?").arg((double) fee / COIN).arg((double) minFee / COIN), QMessageBox::Yes | QMessageBox::Cancel, QMessageBox::Cancel);
  