- [x] add `concretize.lp`, `spack.yaml`, etc. to licensed files
- [x] update all licensed files to say 2013-2021 using
`spack license update-copyright-year`
- [x] appease mypy with some additions to package.py that needed
for oneapi.py
Use `spack pkg changed` and `spack maintainers` to figure out which
packages changed and who their maintainers are in a PR.
Add any maintainers to the PR as reviewers.