4.4BSD snapshot (revision 8.1); add 1993 to copyright

ip_output takes 5 args now; other miscelleny due to prototypes in header files

trailing comment after #else or #endif

make kernel includes standard

move common mtu estimation to tp_route_to; here determine
only where the rtentry pointer is found in the npcb, and provide net hdr size

this changes reflect getting rid of so_tpcb.

new copyright; att/bsd/shared

parameters to in_pcbnotify changed

check for duplicate CR's; allow intercepting all CR's to a given
nsap; not yet tested, but check in for tape anyhow

changes to accomodate changes in in_pcbnotify.

checkpoint for ``alpha tape''; tp is still a little broken.

../h => (implicitly) ../sys

Checkpoint as of first successful tp connection, before posix, &
before mckusick starts incorporating gnodes

date and time created 88/12/14 15:30:00 by sklower