4.4BSD snapshot (revision 8.1); add 1993 to copyright
for LLC2/2, there may be many pkp's to one xcp;so stuff pkp in m_pkthdr.rcvif, and change conventions for pk_ctlinput to get pkp
assign SCCS numbers for ``June'' beta tape; not yet tested.
install combined copyright headers using sccs include for terms
date and time created 90/05/11 11:19:37 by sklower