JASCIS-110: Added netcdf function to get attributes and variables
JASCIS-110: Style
JASCIS-110: Create selector for ncar raf product.

Note does not yet work from command line because NCAR-RAF not in product.py
JASCIS-110: Make parser work for products not in product.py
JASCIS-110: Add station GASP data to reader
JASCIS-110: Add optional file test on choosing product