ftpd: Prevent disclosure of system version.
telnetd: Portability of banner.
telnetd: Reverse resolution of client.

The use of `-U/--reverse-lookup' always caused
a denied access, when built with the macro IPV6 set.
rlogind: Error handling.
rshd: Require host name.
traceroute: Portability of PID range.
traceroute: Gateway selection.
talk, talkd: Convenience changes.
bootstrap: Updated from gnulib.
talkd: Less ACL-logging.
Documentation (silent change)
talkd: Small audit of ACL.