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 in all subdivision units
+    questionString.append("<hr />");
+    qint64 totalAmount = currentTransaction.getTotalTransactionAmount() + txFee;
+    QStringList alternativeUnits;
+    foreach(BitcoinUnits::Unit u, BitcoinUnits::availableUnits())
     {
-        // add total amount string if there are more then one recipients or a fee is required
-        questionString.append("<hr />");
-        questionString.append(tr("Total Amount %1").arg(BitcoinUnits::formatWithUnit(model->getOptionsModel()->getDisplayUnit(), currentTransaction.getTotalTransactionAmount()+txFee)));
+        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 />")),