Sat Apr 18 22:18:12 1998  Tim Janik  <timj@gtk.org>

        * gtk/gtkradiomenuitem.h:
                * gtk/gtkradiomenuitem.c (gtk_radio_menu_item_set_group): new function
                        ala gtk_radio_button_set_group.
                                (gtk_radio_menu_item_init): assure that we always have at least a group
                                        that points to self.

                                                * gtk/gtkradiobutton.c (gtk_radio_button_set_group): few cleanups and
                                                        added g_return_if_fail() statements.
                                                                (gtk_radio_button_init): assure that we always have at least a group
                                                                        that points to self.