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### Issue description
The datadir field on the debug window displays incorrectly if the profile folder name is accented.

### How to reproduce
1. Create a profile with accented profile folder name (àèìòùáéíóú)
2. Run bitcoin core with the default datadir
3. Go to the debug window and look at the datadir field

### Expected behaviour
The datadir folder path should display correctly.

### Actual behaviour
Accented characters display as a unknown character question mark.

### Screenshots
![Debug Window](https://cloud.githubusercontent.com/assets/11365204/20029647/41dee90e-a352-11e6-8784-e5a48798d62e.png)


### Confirmed affected versions
The bug has been tested on the following implementations:

- v0.13.1 from source cross-compiled for Windows x64 on a Ubuntu 14.04 enviroment
- 0.13.0 official Windows x64 binary

### Additional debug info
Copying and pasting the text into a program that is known to support accented characters (Such as Notepad++) still displays unknown character symbols.
{
        uriServer = new QLocalServer(this);
        if (!uriServer->listen(name)) {
            
            QMessageBox::critical(0, tr("Payment request error"),
                tr("Cannot start bitcoin: click-to-pay handler"));
        }
        else {
            connect(uriServer, SIGNAL(newConnection()), this, SLOT(handleURIConnection()));
            connect(this, SIGNAL(receivedPaymentACK(QString)), this, SLOT(handlePaymentACK(QString)));
        }
    }
}
PaymentServer::~PaymentServer()
{
    google::protobuf::ShutdownProtobufLibrary();
}
bool PaymentServer::eventFilter(QObject *object, QEvent *event)
{
    if (event->type() == QEvent::FileOpen) {
        QFileOpenEvent *fileEvent = static_cast<QFileOpenEvent*>(event);
        if (!fileEvent->file().isEmpty())
            handleURIOrFile(fileEvent->file());
        else if (!fileEvent->url().isEmpty())
            handleURIOrFile(fileEvent->url().toString());
        return true;
    }
    return QObject::eventFilter(object, event);
}
void PaymentServer::initNetManager()