Add widget to browse directory. Refs #6555.

Code/Mantid/scripts/Interface/reduction_gui/widgets/base_widget.py

@@ -89,7 +89,18 @@ def get_state(self):
             Returns an object with the state of the interface
         """
         return NotImplemented
-
+
+    def dir_browse_dialog(self):
+        """
+            Pop up a directory dialog box.
+            @param data_type: string used to filter the files
+            @param title: string to use as title
+            @param multi: multiselection is enabled if True
+        """
+        dirname = str(QtGui.QFileDialog.getExistingDirectory(self, "Select Directory"))
+
+        return dirname
+
     def data_browse_dialog(self, data_type=None, title=None, multi=False):
         """
             Pop up a file dialog box.