Darwin3/IGSM (ProGrow): code and parameters

MITgcm code (available trhough http://mitgcm.org), with Darwin ecosystem code (available at https://github.com/darwinproject/darwin3). Equations are provided at: https://darwin3.readthedocs.io/en/latest/phys_pkgs/darwin.html. Exact version, modifications and input datafiles used in Dutkiewicz et al (2024) are in the tarball available here. See directory dar6 in the tarball: code modifications are in in "code_31+16+3_igsm_nosed" (for "exponential" growth function) "code_31+16+3_igsm_nosed_prolim" (for "metabolic" growth function), runtime files for default simulation are in "run33_6_nosed_eycontrol_nolim" (for "exponential" growth) and in "run33_6_nosed_eycontrol_prolim_ksat" (for "metabolic" growth); Model parameters are listed in darwin_params.txt and darwin_traits.txt.