Display configuration capplet

[Bryce Harrington <bryce bryceharrington org>]

I am in the process of rewriting the display configuration tool we use
in Ubuntu.  The hard part of this effort has been porting logic out of
xrandr into libxrandr; keithp advises me to create a new library rather
than add to libxrandr, but I may not get to that soon.  I assume you
guys won't be interested in this until that gets done and take upstream.

In any case, here is a screenshot of what I have currently:

 http://bryceharrington.org/files/screenrez_a.png

This is just building from the existing C/Gtk screen resolution tool,
and adding xrandr 1.2 calls for setting up additional monitors, etc.  It
does not modify xorg.conf, although there are some settings such as
increasing the Virtual Size which may require xorg.conf modifications,
but I'm leaving that as a separate problem to keep the implementation
simpler for now.

Bryce