qt: show all units in send confirmation

Make users accustomed to the other subdivision units (mBTC, muBTC)
by showing the total amount in all units in the confirmation dialog.

This was recently raised on the mailing list and could be a preparation
for switching over the default unit eventually.

src/qt/sendcoinsdialog.cpp

@@ -217,12 +217,19 @@ void SendCoinsDialog::on_sendButton_clicked()
         questionString.append("</span> ");
         questionString.append(tr("added as transaction fee"));
     }
-    if(txFee > 0 || recipients.count() > 1)
-    {
-        // add total amount string if there are more then one recipients or a fee is required
+
+    // add total amount in all subdivision units
     questionString.append("<hr />");
-        questionString.append(tr("Total Amount %1").arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), currentTransaction.getTotalTransactionAmount()+txFee)));
+    qint64 totalAmount = currentTransaction.getTotalTransactionAmount() + txFee;
+    QStringList alternativeUnits;
+    foreach(BitcoinUnits::Unit u, BitcoinUnits::availableUnits())
+    {
+        if(u != model->getOptionsModel()->getDisplayUnit())
+            alternativeUnits.append(BitcoinUnits::formatWithUnit(u, totalAmount));
     }
+    questionString.append(tr("Total Amount %1 (= %2)")
+            .arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), totalAmount))
+            .arg(alternativeUnits.join(" "+tr("or")+" ")));
 
     QMessageBox::StandardButton retval = QMessageBox::question(this, tr("Confirm send coins"),
         questionString.arg(formatted.join("<br />")),