If the gconf var allow_bold is changed, this method will be called
        and will change the VTE terminal o.
        displaying characters in bold font.

def allow_bold_toggled(self, settings, key, user_data):
        """If the gconf var allow_bold is changed, this method will be called
        and will change the VTE terminal o.
        displaying characters in bold font.
        """
        for term in self.guake.notebook_manager.iter_terminals():
            term.set_allow_bold(settings.get_boolean(key))