Version 2.3.8 June 11, 2022

Code Quality and/or Miscellaneous Bug Fixes:

• Geant4 code variable name consistency with rest of NEST, and relativistic energy in G4 (Paola Ferrario, PETALO/Basque Foundation for Science)
• More complete installation directions for Geant4 within NEST (Eric Church, DUNE/PNNL)
• Errors are always reported as NEST first in numerator, so e.g. '+' means NEST is too high in mean or width, while '-' means too low.

New Features and New Physics (Matthew Szydagis, LZ/UAlbany):

• Gaussians are now explicitly one of three possible implementations: normal, no negative but 0 pileup allowed, and re-sampled truncation: rare corner cases repaired as a result. Band means impacted due to changed S2 photo-electron normalization but only by O(0.1%). Very minor changes to the chi^2 validations with the LUX Run03 3H and D-D bands.
• S2 longitudinal diffusion model updated based on issue #155 to be higher at high fields, but also higher at low fields (a very different shape). Data in literature remain contradictory, so the Boyle model is preserved as an option, which does match LUX Run02 (surface) better.
• The MIP model has a default Fano-like factor of 1.00 now for total quanta, but F_s = 200 for scintillation versus ionization for the anti-correlation "slosh"