Add new chglg tool

chglog can be used to record a system changelog. It is a simple
utility to capture one-line statements about changes on the the
local system.
Add new white-ice tool

white-ice is an ssh blocker. This first version works on
systems that log sshd messages to /var/log/secure via syslog.
It should be fairly straightforward to port this code to
systemd machines by replacing tail -F -n0 /var/log/secure by
something like journalctl -n0 -f -u sshd.