Mention Maggiolo's map of solar vs standard time.

* tz-link.htm: Add URL and description.  (Thanks to Arthur David Olson.)
* NEWS: Document this.
Turkey begins DST on 2014-03-31, not 03-30.

(Thanks to Faruk Pasin.)
* europe (Turkey): New rule for spring 2014.
(Europe/Istanbul): Use it.
* NEWS: Document this.