Small response files copied unchanged from tests/data in the evalresp repository
(https://github.com/EarthScope/evalresp, `develop` branch, commit ee809db).  They cover cases
the files in ../real and ../synthetic do not: a gain-only first stage, a digital stage normalized
above Nyquist, gain-only channels, polynomial (blockette 62) responses, response lists in
StationXML, StationXML precision, and analog poles/zeros at zero frequency and with excess poles.

station-list-stage2.xml is from a later evalresp commit (90999e1): two response lists, in stages 2 and 3,
after a pole-zero stage.

../real already holds other files copied from the same directory.

tools/make_golden.py evaluates these with the C program to produce ../golden/golden.json.
