Change behavior of skipped and repeated wall times within time zones
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                 Key: CORE-6058
                 URL: http://tracker.firebirdsql.org/browse/CORE-6058
             Project: Firebird Core
          Issue Type: Improvement
          Components: Engine
    Affects Versions: 4.0 Beta 1
            Reporter: Adriano dos Santos Fernandes


Within time zones, some wall times does not exist (DST starting) or repeats 
twice (DST ending).

We should handle that situations using some standard, which a good one could be 
the ECMAScript standard (JavaScript). 

https://raw.githubusercontent.com/tc39/ecma262/master/spec.html

"1:30 AM on November 5, 2017 in America/New_York is repeated twice (fall 
backward), but it must be interpreted as 1:30 AM UTC-04 instead of 1:30 AM 
UTC-05"

"2:30 AM on March 12, 2017 in America/New_York does not exist, but it must be 
interpreted as 2:30 AM UTC-05 (equivalent to 3:30 AM UTC-04)"

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