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.