- [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
* Convert all `url` attributes in `PythonPackage`s to `pypi` attributes * add `pypi =` to flake8 exceptions