1998-03-13  Federico Mena Quintero  <federico@nuclecu.unam.mx>

	* gtk/gtkclist.c (gtk_clist_row_is_visible): Now we return a
	GtkVisibility value, instead of a simple boolean.  Also, changed
	all the functions that expected a boolean value to use
	"!= GTK_VISIBILITY_NONE".

	* gtk/gtkclist.h: Changed prototype for gtk_clist_row_is_visible().

	* gtk/gtkenums.h (enum): Added GtkVisibility enum.