Compare 100% with 99% real information (based on keepbits from xbitinfo)

[rsignell-usgs]

If we saved model output like NWM2.1 with 99% real information content, it would seem like the metrics would not change significantly, and we might save a lot of space.

Here's an example of computing keepbits for some gauges:
https://nbviewer.org/gist/rsignell-usgs/918fba73ffbec6d9fa70f1d336fb3deb

The keepbits vary a lot with gage, because some records have low information content. But if we used the max keepbits, seems we should be okay.