libipc: Add some comments describing possible use of protocol field.
libipc: Add some comments describing possible use of protocol field.

Hopefully we have time to gather some data on this later?

Solid findings either way would be interesting, either:

* Applications /are/ good about not specifying TCP when
  they don't actually care what's done as long as it
  goes where they indicate.  This is a useful
  insight and would motivate a solution like ours
  and the practicality of simply not attempting
  to optimize applications that explicitly ask for TCP.

* Applications are /not/ good about only specifying TCP
  in particular when they don't actually care.
  This also is a nice insight into how applications
  use the socket API and would motivate the use
  of some technology like ours to differentiate
  when TCP is needed and when it isn't.

dtzWill/ipcopter,dtzWill/ipcopter,dtzWill/ipcopter,dtzWill/ipcopter,dtzWill/ipcopter,dtzWill/ipcopter