Remove fake and no-more existing countries

The countries returned by the Zend library contains fake countries and no-more existing countries.
This update removes all the fake countries and allow users to strip out or not no-more existing countries.

Compared with the previous code, I added these fake countries:
* FX Metropolitan France
* NT Neutral Zone
* PU U.S. Miscellaneous Pacific Islands

And I marked as no-more existing these countries:
* CS Serbia and Montenegro
* CT Canton and Enderbury Islands
* DD East Germany
* PC Pacific Islands Trust Territory
* PZ Panama Canal Zone
* SU Union of Soviet Socialist Republics
* VD North Vietnam
* YD People's Democratic Republic of Yemen

(previously SU and VD where stripped out as if they were fake)