CohenBerkeleyLab/BEHR-core: Version 3.0B

Changes from version 3.0A to 3.0B include:

• Change in ocean reflectivity LUT from 430 nm to 460 nm
• Implementation of variable tropopause pressure
• Fix so that AMFs and VCDs are set to NaN/fill value if any of the NO2 profile, clear or cloudy scattering weights, or temperature profiles are all NaNs for that pixel
• Cloud pressure clamped to <= surface pressure for the AMF calculation, this deals with an issue where the NO2 profile can have NaNs in it during the calculation of the cloudy AMF because it was not extrapolated far enough to reach to cloud pressure. Also, physically, cloud top should not be below the surface.
• Implementation of the hyposometric equation to calculation the surface pressure pressure as suggested in Zhou et al. 2009