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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.
{
    qDebug() << "NotifyAlertChanged";
    QMetaObject::invokeMethod(clientmodel, "updateAlert", Qt::QueuedConnection);
}
static void BannedListChanged(ClientModel *clientmodel)
{
    qDebug() << QString("%1: Requesting update for peer banlist").arg(__func__);
    QMetaObject::invokeMethod(clientmodel, "updateBanlist", Qt::QueuedConnection);
}
static void BlockTipChanged(ClientModel *clientmodel, bool initialSync, const CBlockIndex *pIndex, bool fHeader)
{
    
    
    
    int64_t now = 0;
    if (initialSync)
        now = GetTimeMillis();
    int64_t& nLastUpdateNotification = fHeader ? nLastHeaderTipUpdateNotification : nLastBlockTipUpdateNotification;
    
    if (!initialSync || now - nLastUpdateNotification > MODEL_UPDATE_DELAY) {
        
        QMetaObject::invokeMethod(clientmodel, "numBlocksChanged", Qt::QueuedConnection,
                                  Q_ARG(int, pIndex->nHeight),
                                  Q_ARG(QDateTime, QDateTime::fromTime_t(pIndex->GetBlockTime())),
                                  Q_ARG(double, clientmodel->getVerificationProgress(pIndex)),
                                  Q_ARG(bool, fHeader));
        nLastUpdateNotification = now;
    }
}
void ClientModel::subscribeToCoreSignals()