Inserts a new tab for this widget.

        :param      index  | <int>
                    widget | <QtGui.QWidget>
                    title  | <str>

def insertTab(self, index, widget, title):
        """
        Inserts a new tab for this widget.

        :param      index  | <int>
                    widget | <QtGui.QWidget>
                    title  | <str>
        """
        self.insertWidget(index, widget)
        tab = self.tabBar().insertTab(index, title)
        tab.titleChanged.connect(widget.setWindowTitle)