Free the display_key.

Free the display_key.

2003-09-08  Federico Mena Quintero  <federico@ximian.com>

	* gtkfilesystem.c (gtk_file_info_free): Free the display_key.

	* gtkfilechooserimpldefault.c (list_mtime_data_func): New
	function.
	(create_file_list): Add a modification time column; remove the
	size column.
	(mtime_sort_func): New callback.
	(tree_selection_changed): Add a sorting function for the mtime
	column.  Have the model fetch the modification time as well.
	(tree_selection_changed): Do allow the file list model to show
	directories.

	* testfilechooser.c (my_new_from_file_at_size): Do not try to read
	non-regular files.