Now use the base system's tzdata, which we update regularly...

* Avoid warnings for PDO and SimpleXML.
* APC and ioncube are dead.

* Shift athctrl to /usr/local, and lose the ".sh" prefix as the
  common practice is to not use a suffix for those utilities.  Also
  sync the file with src.git/tools/tools/ath/athctrl.sh, even
  though the changes are only cosmetic.

* /sbin/dhclient-script already exists and was overwritten.  Worse
  still, /usr/local/sbin/dhclient-script also exists.  To "clean"
  this up, rename the modified file to dhclient-script.ext.  Our
  management system picks up the correct file anyway.

This allows to pull a configuration from the installed system
via bsdinstaller and then either boot into the LiveCD or install
the system again.  Especially useful in an upgrade scenario so
that the system is cleaned but all settings are preserved.