Make binding to Beyond optional
Make binding to Beyond optional

Most people won't have Pangolin Beyond, and trying to bind to it with no
network (including the virtual network set up by VMware when I am
running Beyond in a local Windows VM) causes use-sample-show to crash
with a routing exception. Don't even try that unless asked to, so shows
can run with no network.

brunchboy/afterglow,brunchboy/afterglow,brunchboy/afterglow