add clamp_node argument (toplevel): update usages of

add clamp_node argument (toplevel): update usages of

Fri Apr 12 18:32:46 2002  Kristian Rietveld  <kris@gtk.org>

        * gtk/gtktreeview.c (gtk_tree_view_real_set_cursor): add
        clamp_node argument
        (toplevel): update usages of gtk_tree_view_real_set_cursor,
        (gtk_tree_view_focus_to_cursor): don't let
        gtk_tree_view_real_set_cursor clamp the node, so you won't get
        unexpected scrolling