- environment stuff and headers included to use ecearth2 with Lindgren

New option:vert_Tsections to plot zonal temperature sections along 45S, 0N, 45N and meridional temperature sections along 30W, 80E, 180E

New variables: dew point, convective precipitation, 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

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

- a few other minor things related with ecearth and ifs templates dealed

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