- remove the old LGPL license headers from all files in Spack
- add SPDX headers to all files
- core and most packages are (Apache-2.0 OR MIT)
- a very small number of remaining packages are LGPL-2.1-only
* grib-api: add version 1.21.0
* libemos: add version 4.4.7 and allow choice of eccodes or grib-api
* magics: add version 2.32.0
* libemos: add description for eccodes variant
Pro tips from @adamjstewart:
* line too long in package description
* name it grib-api instead of grib_api
* depend on netcdf without reference to unnecessary constraints