Only cfs available for daily values

[inkenbrandt]

Sometimes gage stations have gage height and other variables reported with cfs. Find a way to include these.

[inkenbrandt]

Here is the code that would have to be changed: https://github.com/inkenbrandt/WellApplication/blob/master/wellapplication/usgs.py#L123-L150

Right now, the cfs column is returned as value, so the fix should retain that because other stuff depends on it.