Introduce end-to-end performance tests on medium-sized data

This isn't quite done, but figured it's at a good spot to get feedback.

In particular the cluster security isn't set up correctly yet and thus this hasn't been tested end-to-end.
> Can this just be a split by delimiter and join in column names?

```
STN--- WBAN   YEARMODA    TEMP       DEWP      SLP        STP       VISIB      WDSP     MXSPD   GUST    MAX     MIN   PRCP   SNDP   FRSHTT
064510 99999  19710201    36.5 24    27.7 24  1018.7 24  9999.9  0    8.2 24   14.6 24   22.0  999.9    43.0*   30.0* 99.99  999.9  010000
```

Sort of. The only reason I did it with substrings was that the ["spec"](ftp://ftp.ncdc.noaa.gov/pub/data/gsod/GSOD_DESC.txt) is quite specific about each column width.

Would you prefer I change it? (Happy to, just checking)