* gtk/gtkvscale.c (gtk_vscale_pos_trough): take value_spacing into
account for GTK_POS_LEFT.
* gtk/gtkradiobutton.c (gtk_radio_button_set_group): use
gtk_toggle_button_set_active () to set the new state.
(gtk_radio_button_new): only _set_group if group != NULL.
(gtk_radio_button_clicked): reference the widget.
(gtk_radio_button_init): make radio buttons active upon
startup.