download_FSL_sounding_data: Download an upper air data file in the FSL format
In rich-iannone/PuffR: A set of tools to help with CALPUFF dispersion modelling.

Download an upper air data file from NOAA in the FSL format.

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download_FSL_sounding_data(sounding_priority, df_soundings,
  station_list_position, starting_hour, level_type, wind_units, beginning_date,
  ending_date)

`sounding_priority`	a character string that determines the priority of the sounding; choices are either "primary" or "secondary".
`df_soundings`	a data frame containing a complete database of global sounding sites.
`station_list_position`	the row of interest from the 'df_soundings' data frame.
`starting_hour`	the starting hour for the sounding data.
`level_type`	the type of levels to obtain from the FSL upper air sounding data.
`wind_units`	the type of wind units to obtain from the FSL upper air sounding data.
`beginning_date`	the beginning date of the requested sounding data.
`ending_date`	the ending date of the requested sounding data.