This uses pbr for setup.py which automatically extracts features
and entrypoints out of setup.cfg otherwise you would have to type
this by hand.

Some fields of setup.cfg still need changing the have been
commented out in the meantime.

L2SS-192: reserved_0 -> reserved to not be overly defensive. if there are multiple reserved fields in the future, we'll deal with that by then.

L2SS-192: Provide interface for raw header fields, add example packet (needs to be a better one, but this is all we have for now)

L2SS-192: Provide interface for raw header fields, add example packet (needs to be a better one, but this is all we have for now)

Makes synchronisation with pypcc much easier.