Show relative path in title bar for when browsing dir recursive

imageringlist.h

@@ -79,6 +79,7 @@ public:
     void setFile(const QString &file);
     void setFiles(QStringList files);
     ImagePtr currentImage();
+    QString currentDir() const;
     void setLiveMode(bool live);
     void setCalculateStats(bool stats);
     void setFindPeaks(bool findPeaks);
@@ -117,7 +118,7 @@ signals:
     void currentImageChanged(int index);
 protected slots:
     void imageLoaded(Image *image);
-    void dirChanged(QString dir);
+    void dirChanged(QString);
     void reloadDir();
 };