[tz] zdump new option -i for easier-to-review output

[Garrett Wollman]

<<On Sun, 21 Aug 2016 20:53:08 -0700, Paul Eggert <eggert at cs.ucla.edu> said:

> The regression data will bloat the tz distribution somewhat, though,
> so to help out with that let's distribute a single tarball
> containing both code and data (this was suggested during the
> previous millennium, so it's about time :-), and while we're at it,
> use a better compressor than gzip. (For compatibility we'll still
> distribute the old-format .tar.gz pair for a while.) I'll propose a
> patch for that too.

Please no, for the reasons amply stated by others in this thread.

-GAWollman