Fix, NSTimeZone Abbreviations

[Georg Fleischmann]

Hi,

I realized that the list of time zone abbreviations coming with GNUstep is  
very long and all keys are used multiple times. The dictionary generated for  
mapping uses the first match from the file, which would map CET to Africa  
(which would map back to WET). This is wrong, of course.

The abbreviation dictionary on OpenStep and Mac OS-X is a defined one to one  
mapping, which allows a much better conversion.
I would suggest to replace the abbreviation file on GNUstep with the shorter  
one-to-one list.

Here are the lists used on OpenStep and Apple. There is only a minor  
difference between them (Apple added UTC and removed HDT).

Georg



OpenStep:

{
    ADT = America/Halifax;
    AFT = Asia/Kabul;
    AKDT = America/Juneau;
    AKST = America/Juneau;
    AST = America/Halifax;
    CDT = America/Chicago;
    CEST = Europe/Rome;
    CET = Europe/Rome;
    CST = America/Chicago;
    EDT = America/New_York;
    EEST = Europe/Warsaw;
    EET = Europe/Warsaw;
    EST = America/New_York;
    GMT = GMT;
    HDT = Pacific/Honolulu;
    HKST = Asia/Hong_Kong;
    HST = Pacific/Honolulu;
    JST = Asia/Tokyo;
    MDT = America/Denver;
    MSD = Europe/Moscow;
    MSK = Europe/Moscow;
    MST = America/Denver;
    NZDT = Pacific/Auckland;
    NZST = Pacific/Auckland;
    PDT = America/Los_Angeles;
    PST = America/Los_Angeles;
    WEST = Europe/Paris;
    WET = Europe/Paris;
    YDT = America/Yakutat;
    YST = America/Yakutat;
}


Mac OS X:

{
    ADT = America/Halifax;
    AFT = Asia/Kabul;
    AKDT = America/Juneau;
    AKST = America/Juneau;
    AST = America/Halifax;
    CDT = America/Chicago;
    CEST = Europe/Rome;
    CET = Europe/Rome;
    CST = America/Chicago;
    EDT = America/New_York;
    EEST = Europe/Warsaw;
    EET = Europe/Warsaw;
    EST = America/New_York;
    GMT = GMT;
    HKST = Asia/Hong_Kong;
    HST = Pacific/Honolulu;
    JST = Asia/Tokyo;
    MDT = America/Denver;
    MSD = Europe/Moscow;
    MSK = Europe/Moscow;
    MST = America/Denver;
    NZDT = Pacific/Auckland;
    NZST = Pacific/Auckland;
    PDT = America/Los_Angeles;
    PST = America/Los_Angeles;
    UTC = UTC;
    WEST = Europe/Paris;
    WET = Europe/Paris;
    YDT = America/Yakutat;
    YST = America/Yakutat;
}