packaging improvements
- gemini3d.run -plan: print MPI image count on own line for tool parsing
- scripts/CMakeLists.txt to build and install prereq packages
- read_dnew2d: adapt to proper and workaround read
- gemini3d.run: apple M1 workaround CPU count
- ctest labels
- improve mumps link robustness
- h5fortran: fix findhdf5
- h5fortran 3.6.5 self-find HDF5
- mat_gemini v4.1.6