Fix node::port_number_{in,out} to actually work

I wasn't searching correctly and didn't notice this until actually
trying to run the code...  Whoops!
Change ocn-neighbors to print input port assignments

This just makes the information I'm now storing availiable to
command-line users.
Add '"' around node names

With any luck this will make the output of ocn-neighbors sane to
parse... :).
Add a "missing" private

This doesn't actually change anything, I usually just stick an extra
"private" between my static methods and member methods.  This way I
won't screw it up later.