dbhub: Open the user's directory by default

When 'logging in' or refreshing the view, look for the user's directory
and open it by default.

src/RemoteModel.h

@@ -86,6 +86,10 @@ public:
     // Returns the current client certificate
     const QString& currentClientCertificate() const;
 
+signals:
+    // This signal is emitted whenever a directory listing has been received and parsed
+    void directoryListingParsed(QModelIndex parent);
+
 private slots:
     // This is called whenever a network reply containing a directory listing arrives. json contains the reply data, userdata
     // contains some custom data passed to the request. In this case we expect this to be the model index of the parent tree item.