Added focus handling, horizontal and vertical autoscrolling, extended

Added focus handling, horizontal and vertical autoscrolling, extended

* gtk/gtkctree.h :
* gtk/gtkctree.c :
  Added focus handling, horizontal and vertical autoscrolling,
  extended Selection Mode, key bindings
  Added gtk_ctree_toggle_expansion & gtk_ctree_toggle_expansion_recursive
  Changed gtk_ctree_scroll_to to gtk_ctree_moveto.
  Removed gtk_ctree_clear.

* gtk/gtkclist.h :
* gtk/gtkclist.c :
  Added focus handling, horizontal and vertical autoscrolling,
  extended Selection Mode, key bindings