Finalize settings for 3D Greenland thermal forcing processing

[trhille]

Increase number of ocean levels, with higher density near surface. Also update calibration targets, using only north and north_east regions for calibration.

Checklist

• Document (in a comment titled Testing in this PR) any testing that was used to verify the changes

[trhille]

Testing

I processed the Greenland OCX forcing with these settings. Compare these with the previous settings in #979:

A test run shows that this results in reasonable melt rates (July, 2007):

(note: the calibration achieved 10 m/yr average melt for north and north_east over the 2002–2012 period, which is why this time series starting Jan 1 2007 does not produce exactly 10 m/yr to start)

[matthewhoffman]

These look like good adjustments.