removed functions g_dataset_id_set_destroy and g_datalist_id_set_destroy

removed functions g_dataset_id_set_destroy and g_datalist_id_set_destroy

Thu Oct  8 06:47:27 1998  Tim Janik  <timj@gtk.org>

        * glib.h:
        * gdataset.c: removed functions g_dataset_id_set_destroy and
        g_datalist_id_set_destroy and macros g_dataset_set_destroy and
        g_datalist_set_destroy.
        added new functions g_dataset_id_remove_no_notify and
        g_datalist_id_remove_no_notify plus associated macros
        g_dataset_remove_no_notify and g_datalist_remove_no_notify, which
        will remove a certain data portion without invokation of its destroy
        notifier, this should only be used in very controled circumstances.