* fix remaining flake8 errors
* imports: sort imports everywhere in Spack
We enabled import order checking in #23947, but fixing things manually drives
people crazy. This used `spack style --fix --all` from #24071 to automatically
sort everything in Spack so PR submitters won't have to deal with it.
This should go in after #24071, as it assumes we're using `isort`, not
`flake8-import-order` to order things. `isort` seems to be more flexible and
allows `llnl` mports to be in their own group before `spack` ones, so this
seems like a good switch.
- [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
* dtfbplus: New package.
* dftbplus: Addresses @adamjstewart's comments on PR #15191
* dftbplus: Fixes format() calls that slipped in previous commit.
* dftbplus: Appease flake8.
* dftbplus: Change 'url' and misc. fixes.
* Add a resource to do the job of './utils/get_opt_externals'
