[feature/update_to_spack_v1] Update NRL batch install script and NRL site configs; add flag to 'spack stack create env' to promote warnings to errors; updates from develop and release/1.9.0 branches

[feature/update_to_spack_v1] Update NRL batch install script and NRL site configs; add flag to 'spack stack create env' to promote warnings to errors; updates from develop and release/1.9.0 branches #1262