This can't work without a significant rework (because we can't
use GnomeRR in the mutter process, now that's DBus API implemented
by mutter itself, and the monitor config API is private to mutter
for now), and I doubt it's really useful to anyone.
Also, we have an orientation lock button, which kind of serves
a similar purpose
As part of the new unified status menu, the old status menu
was reworked considerably in 3.9.5, and the extension as it
was written does not make sense.
If hibernation is needed, it should be added (through another
extension) in the shutdown dialog.
