Clear lines in terminal below current cursor position as required

        This is important to do before drawing to ensure sufficient
        room at the bottom of your terminal.

        :type  tree: dict
        :param tree: tree as described in ``BarDescriptor``

def make_room(self, tree):
        """Clear lines in terminal below current cursor position as required

        This is important to do before drawing to ensure sufficient
        room at the bottom of your terminal.

        :type  tree: dict
        :param tree: tree as described in ``BarDescriptor``
        """
        lines_req = self.lines_required(tree)
        self.cursor.clear_lines(lines_req)