oceColorsViridis: Create colors similar to the matlab Viridis scheme
Description
This is patterned on a matlab/python scheme (reference 1) that blends
from yellow to blue in a way that is designed to reproduce well
in black-and-white, and to be interpretable by those with
certain forms of color blindness (references 3-4).
Light, A., and P. J. Bartlein, 2004. The End of the Rainbow? Color
Schemes for Improved Data Graphics. Eos Trans. AGU, 85(40),
doi:10.1029/2004EO400002.
Martin Jakobsson, Ron Macnab, and Members of the Editorial Board, IBCAO.
Selective comparisons of GEBCO (1979) and IBCAO (2000) maps.
https://www.ngdc.noaa.gov/mgg/bathymetry/arctic/ibcao_gebco_comp.html.
Stephenson, David B., 2005. Comment on ``Color schemes for improved data
graphics,'' by A. Light and P. J. Bartlein. Eos Trans. AGU, 86(20).