[tz] Reason for removal of several TZ

[Michael H Deckers]

On 2017-12-04 00:45, Paul Eggert proposed a list of abbreviations:


> +NST/NDT/NWT/NPT/NDDT Newfoundland,
> +NZMT/NZST New Zealand through 1945,

   This seems to miss
                    NST/NDT/NWT/NPT Nome

   There is also the question of whether Theory covers
   backzone or not. In the case that the lists should
   include backzone data, abbreviations such as ADMT,
   and AMT for Asmara must be mentioned; otherwise
   it should be mentioned that additional uses of
   abbreviations in backzone are not listed.

   Michael Deckers.