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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.
#include <QFile>
#include <QFileOpenEvent>
#include <QHash>
#include <QList>
#include <QLocalServer>
#include <QLocalSocket>
#include <QNetworkAccessManager>
#include <QNetworkProxy>
#include <QNetworkReply>
#include <QNetworkRequest>
#include <QSslCertificate>
#include <QSslError>
#include <QSslSocket>
#include <QStringList>
#include <QTextDocument>
#if QT_VERSION < 0x050000
#include <QUrl>
#else
#include <QUrlQuery>
#endif
const int BITCOIN_IPC_CONNECT_TIMEOUT = 1000; 
const QString BITCOIN_IPC_PREFIX("bitcoin:");
const char* BIP70_MESSAGE_PAYMENTACK = "PaymentACK";
const char* BIP70_MESSAGE_PAYMENTREQUEST = "PaymentRequest";
const char* BIP71_MIMETYPE_PAYMENT = "application/bitcoin-payment";
const char* BIP71_MIMETYPE_PAYMENTACK = "application/bitcoin-paymentack";
const char* BIP71_MIMETYPE_PAYMENTREQUEST = "application/bitcoin-paymentrequest";
const qint64 BIP70_MAX_PAYMENTREQUEST_SIZE = 50000;
X509_STORE* PaymentServer::certStore = NULL;
void PaymentServer::freeCertStore()