minor fixes from cgd@alpha.bostic.com

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

trailing comment after #else or #endif

changes sufficient for tuba & idrp; may want to rethink this

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

calculate mtu for tp_pcb based on route

fix from mostek@cray

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

cltp_usrreq.c made separate file in conf/files

merged with mitre decbit changes; mark version sent to NIST.

checkpoint cltp changes before merging in mitre decbit changes

avoid redundantly and incorrectly looking up route to get mtu.

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

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

date and time created 88/12/14 15:30:03 by sklower