* libnautilus/nautilus-global-preferences.c,
* libnautilus/nautilus-global-preferences.h:
(nautilus_global_preferences_get_meta_view_iids) Add a table of
meta view iids and a function to retrieve them.  This is a hack
until we have better runtime detection of components.
Add some better defaults for which meta views are shown.  By
default none were shown.  Undo a previous gnome_config default
hack.  There is now a better fix in place in the prefs code.

* nautilus-widgets/nautilus-preferences.c:
(nautilus_preferences_make_gnome_config_string) A new function to
make a string as expected by gnome_config with a trailing default
value.  Use this string to fetch the value of the preferences.

* src/Makefile.am,
src/ntl-prefs.c,
src/ntl-prefs.h,
src/nautilus-window-menus.c,
src/nautilus.h:
Retire ntl-prefs.c and ntl-prefs.h.  Remove these 2 from build and
all references to them.

* src/ntl-app.c:
(nautilus_app_startup, nautilus_app_destroy) No need to call
retired ntl-prefs functions.

* src/ntl-uri-map.c:
(add_meta_view_iids_from_preferences): New function.  Factor out
meta iid setup code into one place.  Replace the static meta iid
setup code with something that looks in preferences to see which
meta views are enabled.  Next step is to make the meta view
respond to pref changes.