Draft for documenting USES=gnome in the porters-handbook. The part in
using-gnome needs more work but I'm blanking atm.
I put a blob in the start of the page about needing USES=gnome, instead of
rewriting text all over the place to take into account that USES=gnome needs
to be added too. Currently the USES=gnome uses a <programlisting> but that
looks ugly to me, it breaks up the text in bad ways (in my eyes). Maybe
use <literaly> instead? I'm open for some expert suggestions.
And the summary is more text then the actualy diff, yay me....