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

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

SCCS-vsn: libexec/lfs_cleanerd/lfs_cleanerd.8 8.1
SCCS-vsn: share/man/man5/a.out.5 8.1
SCCS-vsn: share/man/man5/acct.5 8.1
SCCS-vsn: share/man/man5/core.5 8.1
SCCS-vsn: share/man/man7/ascii.7 8.1
SCCS-vsn: share/man/man5/dir.5 8.1
SCCS-vsn: share/man/man7/environ.7 8.1
SCCS-vsn: share/man/man5/disktab.5 8.1
SCCS-vsn: share/man/man7/eqnchar.7 8.1
SCCS-vsn: share/man/man5/dump.5 8.1
SCCS-vsn: share/man/man5/fs.5 8.1
SCCS-vsn: share/man/man7/hier.7 8.1
SCCS-vsn: share/man/man7/hostname.7 8.1
SCCS-vsn: share/man/man5/fstab.5 8.1
SCCS-vsn: share/man/man7/intro.7 8.1
SCCS-vsn: share/man/man5/group.5 8.1
SCCS-vsn: share/man/man7/mailaddr.7 8.1
SCCS-vsn: share/man/man5/hosts.5 8.1
SCCS-vsn: share/man/man7/man.7 8.1
SCCS-vsn: share/man/man5/networks.5 8.1
SCCS-vsn: share/man/man7/mdoc.7 8.1
SCCS-vsn: share/man/man5/passwd.5 8.1
SCCS-vsn: share/man/man5/phones.5 8.1
SCCS-vsn: share/man/man5/printcap.5 8.1
SCCS-vsn: share/man/man5/protocols.5 8.1
SCCS-vsn: share/man/man7/mdoc.samples.7 8.1
SCCS-vsn: share/man/man5/remote.5 8.1
SCCS-vsn: share/man/man5/resolver.5 8.1
SCCS-vsn: share/man/man5/services.5 8.1
SCCS-vsn: share/man/man5/shells.5 8.1
SCCS-vsn: share/man/man7/ms.7 8.1
SCCS-vsn: share/man/man5/stab.5 8.1
SCCS-vsn: share/man/man7/operator.7 8.1
SCCS-vsn: share/man/man5/types.5 8.1
SCCS-vsn: share/man/man7/term.7 8.1
SCCS-vsn: share/man/man5/utmp.5 8.1