New variables : dew point, convective precip, evaporation, snowfall,  surface solar radiation upward, surface solar clear sky radiation, surface thermal radiation downward, surface thermal radiation upward, top thermal radiation, total cloud cover, 3d vertical wind, 3d cloud fraction, 3d cloud water content, 3d cloud ice content

Possibility of computing mixed layer heat content only instead of heat and salt content in heat_sal_mxl

- stopped use of "tmp_output_dir" for ecearth3.post

- inclusion of common_ocean_post.txt in job script

additional call to ohc_specified_layer to compute map of 300-800m heat content on top of 0-300m one already included