[tz] [PROPOSED] Rename internal identifiers to match RFC 8536

[Paul Eggert]

On 6/18/19 6:04 AM, Tony Finch wrote:
> Paul Eggert<eggert at cs.ucla.edu>  wrote:
>> The "GMTOFF"-to-"DSTOFF" change affects only comments
> GMT replaced by STD or DST?

That was a typo in my email. The current proposal is for comments in 
data to use "STDOFF" (not "DSTOFF") to refer to the difference between 
standard time and UT. I suppose the mnemonic could be "standard-time 
offset". Sorry about the confusion.