BUGFIX MSIS2.0, enhancements to HDF5, grid and neutral
MSIS 2.0 has a known bug causing all-zero output acknowledged by the authors along with our patch applied in Gemini3D.
HDF5 is more easily found on MacOS, particularly with MacPorts and Homebrew, despite the presence of Anaconda Python.
Grid and Neutral enhancements by @mattzett
Minor Rearchitect gemini.bin to make amenable for libgemini future work