[tz] Some rules in tz specification files seem to be applied (by zic) outside of their declared period of applicability

[Paul Eggert]

Arthur David Olson wrote:
> zic computes transition times for each zone line (initial or continuation).
> As it processes each zone line, it looks for the first transition time
> after which standard time is in effect; the abbreviation in use after that
> transition is remembered (for readers of the code, remembered in
> "startbuf"). After all the transitions for a particular zone continuation
> line have been computed, zic tosses in a transition for the line's start
> time (the previous line's "until" time) (for readers of the code, it is the
> "if (usestart)" section near the end of the main loop in "outzone").

Thanks for clarifying this point, which should be documented. I gave it a shot 
by installing the attached proposed patch.
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