- Add a built-in station data frame (or re-add, as it were)
- Don't check for updated data every time, check once a day for good data, or once every 15 minutes when there was an error in the last check.
- Add Sentinel option to map_stations, and bring it in line with the senamhiR package.
- Kill global NOTEs.
- Some other small things and documentation fix-up.