Allow regular lat/lon grids in InputNetcdfCf

* When the grid is a regular lat/lon grid, then the lat/lons or often
  only provided for the dimension, not for each grid point.
  Automatically detect which format the dataset is in.
* Allow scaling constant for the elevation (if not provided in meters)
Allow future days in SelectorAnalog
* Allow future days to be used as analogs
* Bug when printing available dates. Use the dataset if specified (instead of default
  obs dataset)
* Don't send a warning when opening an auxiliary input
Simple compile error in info driver