- 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
* Added jdk version, added r-ks and r-multicool packages, made some r packages less conservative in their r version requirement
* flake8 fixes
* fix formatting in jdk version cmd
* Added type=('build', 'run') to some R package dependencies,
added some missing dependencies to r-ks. Thanks Adam.
* fix flake8 error