so much...clean up after ralph's merge of wendel and mo code;

so much...clean up after ralph's merge of wendel and mo code;
purge VMUNIX include since changes for signals make it no longer portable
to systems other than 4.2; fix ventel for no echo strapping; do setjmps
instead of assuming interrupted system calls; purge lcmd, if people use

SCCS-vsn: usr.bin/tip/acu.c 4.9
SCCS-vsn: usr.bin/tip/acutab.c 4.7
SCCS-vsn: usr.bin/tip/aculib/biz22.c 4.3
SCCS-vsn: usr.bin/tip/aculib/biz31.c 4.6
SCCS-vsn: usr.bin/tip/cmds.c 4.12
SCCS-vsn: usr.bin/tip/cmdtab.c 4.6
SCCS-vsn: usr.bin/tip/cu.c 4.5
SCCS-vsn: usr.bin/tip/aculib/df.c 4.7
SCCS-vsn: usr.bin/tip/aculib/dn11.c 4.13
SCCS-vsn: usr.bin/tip/hunt.c 4.7
SCCS-vsn: usr.bin/tip/log.c 4.5
SCCS-vsn: usr.bin/tip/partab.c 4.2
SCCS-vsn: usr.bin/tip/remcap.c 4.8
SCCS-vsn: usr.bin/tip/remote.c 4.7
SCCS-vsn: usr.bin/tip/tip.c 4.15
SCCS-vsn: usr.bin/tip/tip.h 4.11
SCCS-vsn: usr.bin/tip/tipout.c 4.8
SCCS-vsn: usr.bin/tip/uucplock.c 4.6
SCCS-vsn: usr.bin/tip/aculib/v3451.c 4.3
SCCS-vsn: usr.bin/tip/aculib/v831.c 4.4
SCCS-vsn: usr.bin/tip/value.c 4.5
SCCS-vsn: usr.bin/tip/vars.c 4.6
SCCS-vsn: usr.bin/tip/aculib/ventel.c 1.4