This script demonstrates downloading and reading iQuam NetCDF format files 
and plot the spatial distribution of the monthly SST field. 

Usage:
```
iquam_dl_read_v2.py [options]

Options:
--ftp_folder=<ftp_folder>   ftp folder to check for iQuam files
                            [Default: ftp://ftp.star.nesdis.noaa.gov/pub/sod/sst/iquam/v2.10/]
--input_file=<filename>     iQuam file to be downloaded
                            [Default: 202009-STAR-L2i_GHRSST-SST-iQuam-V2.10-v01.0-fv00.0.nc]
--output_path=<path>        Where to save iQuam files and results of analysis, default is the directory where the script
                            is run from. [Default: .]
--plot_all=<True, False>    Controls if all files in the output folder are plotted, or just the downloaded file
                            [Default: True]
--skip_dl=<True, False>     Skip downloading any file, essentially turns the script into a plotting scipt
                            [Default: False]
```