Gnssrefl

Bugfixes:

* Fixed output in subdaily. The file with the IF correction was wrong.

Improvements:

* The Files directory was getting too cluttered. I now create and use
a subdirectory for results. The subdirectory is the same as the 4 character
station name unless subdir is chosen on the command line. This has been
linked for vwc, daily_avg, subdaily and the plots for quickLook

* added IF bias correction to subdaily

Bugs:

* csv outputs are currently not working in subdaily.

??

Improvements:

* Rewrote the spline fit used in subdaily. It no longer cuts off data at the
beginning and end of the data series.

* Output files are written with the are interfrequency bias corrected relative to L1.
This output is written to a new column.

* Improved the document header for the RHdot correction

Improvements:

* Added ediff as commandline input to quickLook. The default is 2 degrees and is meant as a
quality control parameters. If you choose 5 and 20 degrees as your elevation angle limits, this
would mean your arcs should be at least from 7 to 18 degrees. If you want to
allow shorter arcs than this, you can make ediff much larger. Within gnssir, it can be defined
in the json file.

New Features:

* refl_zones module added. Command line driven.

* EGM96 is now accessible from gps.py. This provides simple geoid corrections in meters
as a function of latitude and longitude.

Improvements:

* updated download_ioc to allow multi month downloads.