BSD 2 development

BSD 2 development
Work on file src/pi/0.h
Work on file src/pi/OPnames.h
Work on file src/pi/Version.c
Work on file src/pi/ato.c
Work on file src/pi/call.c
Work on file src/pi/case.c
Work on file src/pi/clas.c
Work on file src/pi/const.c
Work on file src/pi/conv.c
Work on file src/pi/cset.c
Work on file src/pi/error.c
Work on file src/pi/fdec.c
Work on file src/pi/func.c
Work on file src/pi/gen.c
Work on file src/pi/hash.c
Work on file src/pi/lab.c
Work on file src/pi/lookup.c
Work on file src/pi/lval.c
Work on file src/pi/main.c

Co-Authored-By: Bill Joy <wnj@ucbvax.Berkeley.EDU>
Synthesized-from: 2bsd