libgnome-desktop: initialize gettext before constructing a wall clock

GnomeWallClock uses gettext, so we must initialize it to point to
the right path.

https://bugzilla.gnome.org/show_bug.cgi?id=699325
Update pnp.ids from upstream hwdata

hwdata now follows Microsoft's database as its upstream,
so updates are quicker.

https://bugzilla.gnome.org/show_bug.cgi?id=699730
gnome-rr: Fix crash when XRRSetCrtcConfig() fails

It's possible for XRRSetCrtcConfig() to fail so we should
wrap it in gkd_error_traps.

https://bugzilla.gnome.org/show_bug.cgi?id=703034
gnome-rr: Fix types of signal vfuncs

... in the class definition. They were missing the object itself.

https://bugzilla.gnome.org/show_bug.cgi?id=704477