If the gconf var compat_backspace be changed, this method
        will be called and will change the binding configuration in
        all terminals open.

def backspace_changed(self, settings, key, user_data):
        """If the gconf var compat_backspace be changed, this method
        will be called and will change the binding configuration in
        all terminals open.
        """
        for i in self.guake.notebook_manager.iter_terminals():
            i.set_backspace_binding(self.getEraseBinding(settings.get_string(key)))