helper get_geonet_quakes doesn't provide a useful error for failed queries

[FinniganIK]

When trying to download info pre-2020 get the following error:

ValueError: Missing column provided to 'parse_dates': 'modificationtime, origintime'

[calum-chamberlain]

This is because the request is too large. When the request is too large the "data/earthquakes.csv" file just contains the response:

bad request: Queried data size too big, please change parameters to reduce query size.

The helper should check this and report this as the error to the user rather than this opaque error!