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

macro and text revision (-mdoc version 3)

new copyright notice

add Berkeley specific copyright notice

update addresses to reflect change form 24 to 32 bit addresses
in config file; rewrite cy.4 and vd.4 as well as vx.4

date and time created 86/11/29 12:14:56 by sam