Updated PR for seaice notebook.

[dabail10]

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I have made several updates to the sea ice notebook here.

1. Modified the cice_vars.yml file to have only three variables. I have created a new cice_vars_full.yml file for other use cases.
2. Changed the color tables from tab20 to ocean.
3. Added some Antarctic plots.
4. Added (in comments) a PBS DASK cluster option for running the notebook within jupyterhub.
5. Modified the cases in config.yml to be historical runs for seaice.
6. As an aside, I have also moved the timeseries files to ice/proc/tseries/month_1 for all of the cases instead of "ts".