1998-10-01  Martin Baulig  <martin@home-of-linux.org>

	* gtk/gtkclist.h (GtkCListColumn): Added `visible'.

	* gtk/gtkclist.c (gtk_clist_set_column_visibility): New function.
	Makes it possible to individually show and hide columns.
	(size_allocate_columns): Adapted to keep track of hidden columns.
	(size_allocate_title_buttons): Likewise.