Add a new command-line option "--no-desktop" as requested by
	fcrozat on behalf of people who want to run Nautilus under KDE as
	well as under GNOME. The option has no effect if Nautilus is
	already running, but if it's the first invocation of Nautilus,
	then no desktop-related preferences show up and the desktop is
	not shown regardless of the setting of those preferences.

	* src/nautilus-main.c: (main): Add the no-desktop option. Make the
	desktop-related preferences invisible if it's on, and pass it down
	to the NautilusApplication.

	* src/nautilus-application.h:
	* src/nautilus-application.c: (nautilus_application_startup):
	Don't start the desktop if no_desktop is passed in. Otherwise
	decide based on the preference.

	* libnautilus-extensions/nautilus-preferences-box.c:
	(preferences_box_find_row): Mark this private function static.
	(preferences_box_populate_pane): Get rid of code that would
	translate the pane_name twice.
	(nautilus_preferences_dialog_new): Simplified this code a bit.

	* libnautilus-extensions/nautilus-preferences.h:
	* libnautilus-extensions/nautilus-preferences.c:
	(preferences_make_user_level_filtered_key),
	(nautilus_preferences_get_is_invisible),
	(nautilus_preferences_set_is_invisible),
	(preferences_key_make_for_getter),
	(nautilus_preferences_visible_in_current_user_level),
	(nautilus_preferences_is_visible): Added new flag to make a
	preference invisible.

	* src/nautilus-first-time-druid.h:
	* src/nautilus-first-time-druid.c: (set_up_gmc_transition_page),
	(nautilus_first_time_druid_show): Removed code that used to make
	the druid default based on the desktop preference.

	Fixed the Tinderbox.

	* libnautilus-extensions/nautilus-global-preferences.c:
	(default_default_folder_viewer_callback): Allow NULL because that
	happens during self-check.