[Gtk-sharp-list] Build note (and a gratuitous screenshot)

[Rachel Hestilow]

At duncan's request, I added libgnomeui to the bindings. So you'll need
to checkout instead of update, and be sure to rerun autogen.sh, run
"make install" instead of make, yada yada.

While I was at it I wrote a small test app in
samples/GnomeHelloWorld.cs. A screenshot is available at
http://primates.ximian.com/~tvgm/gnome-hello.png . Duncan, this app uses
IconList, so you might want to look at it for an example of how to use
the API.

-- Rachel