options `start' and `stop' now (unless I have forgotten any). This allows
us to call the scripts from /etc/rc.shutdown with the correct option.
The (42 or so) ports that already DTRT before are unchanged.
Note: the b14 -> b15 change will loose your cache unless you take
the steps on http://squid.nlanr.net/ to recover it.
Read the Changelog for details, this is a fairly large update.
