Rework the user interface of the file chooser, as per Seth Nickell's

Rework the user interface of the file chooser, as per Seth Nickell's

2004-02-23  Federico Mena Quintero  <federico@ximian.com>

	Rework the user interface of the file chooser, as per
	Seth Nickell's design.

	* gtk/gtkfilechooserdefault.c
	(gtk_file_chooser_default_class_init): Add binding signals and bindings:
		"location-popup" - C-l
		"up-folder"      - C-Up
		"home-folder"    - C-Home
	(up_folder_handler): New function; moved the code from up_button_clicked().
	(up_button_clicked_cb): Call up_folder_handler().
	(home_folder_handler): New function.
	(location_popup_handler): New function.
	(struct _GtkFileChooserDefault): Add an hpaned field.
	(gtk_file_chooser_default_set_current_name): Check that we are in
	Save mode.
	(save_widgets_create): New function, create the widgets specific
	to Save mode.
	(main_paned_create): New function, create the hpaned's widgets here.
	(gtk_file_chooser_default_constructor): Create the open and save
	widgets, and show only one set.
	(gtk_file_chooser_default_set_property): Show/hide the save widgets.
	(gtk_file_chooser_default_get_paths): Only pay attention to the
	entry in Save mode.
	(update_chooser_entry): Update the entry only in Save mode.
	(entry_activate): Removed.