- [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
* Add new MavenPackage build system base class * Fix flake8 and doc tests * More specific regex * Java 8 required for these packages