[tz] Add new timezone for Hanoi Capital, Vietnam

[Lester Caine]

On 18/02/2019 16:40, KP wrote:
> Rules are too confusing or like "Law of the Jungle"
Added to which, there is a lottery as to just what one gets prior to 
1970 anyway. If there ARE documented differences in the pre-1970 
sequences for a location, then it should be documented, but in many 
cases it is simply the latitude which provides the base time offset for 
the whole of that strip of the world independent of any politics. 
Locations should not be thought of a each having their own timezone, but 
rather using a set of rules for a period of time. That rules have 
'location' related tags has been a problem since day one, and the fact 
that user interfaces insist on using those tags DESPITE the rule about 
not doing so does not help and is no reason for adding more locations.

-- 
Lester Caine - G8HFL
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