oceColorsDensity: Create colors suitable for density fields
Description
Create a set of colors for displaying density values,
based on the scheme devised by Kristen M. Thyng
in her cmcolor Python package, which is available at
https://github.com/kthyng/cmocean. The
color specifications were downloaded for use here
on 2015-09-29. To avoid changes in oce scripts,
more recent changes to cmcolor have not been
tracked; oceColorsClosure
has an example of how to incorporate such changes.