privacy: use Krakow in examples, tests and fixturesv0.1.2

A recorded GUGiK fixture was a reverse address lookup for the author's home:
it carried a house number, a postal code and coordinates to about a metre, and
it was published. The place name in the README was the lesser half of the
problem.

Fixtures are re-recorded against Rynek Glowny in Krakow, a public square, and
the tests, spec example and README follow. The README example is regenerated
from the binary.

warnings.json is left as recorded: it is a verbatim national bulletin whose
teryt array lists roughly two hundred powiats, so no single entry says anything
about anyone.

NOTE: this removes the address from the tip, not from history. Commit e14a7db
and its successors still contain it, and remain reachable on any clone or
mirror.

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