Generate only facts for external specs. Substitute the
use of already grounded rules with non-grounded rules
in concretize.lp

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

libuuid is currently contained in util-linux, libuuid and uuid. This
change introduces a new virtual provider `uuid` and renames the existing
`uuid` package to `ossp-uuid`.

util-linux's libuuid is provided in the form of a separate package
util-linux-uuid to make sure that packages depending on uuid and
util-linux can use a separate uuid implementation, which the concretizer
does not allow if libuuid is contained in util-linux.

* GDB: Better Python debugging support

* Auto-load safe path

* Use gdbinit instead

- added several patches
- added some missing dependencies
- remove unneeded dependencies
- add CUDA support
- disable queue support, which was limited, and broken anyway
- move package text that was specific to the package to a comment, so it
  does not show up the environment module
- set conflicts for cuda and compilers
Co-authored-by: Massimiliano Culpo <massimiliano.culpo@gmail.com>

* OpenMPI: Add version 4.1.0

* OpenMPI: Prefer version 4.0.5.

* OpenMPI: Update links

The download links changed, there is currently a redirection but it might not work forever. The website also switched to https.

Enforce PIC for PGI ((https://github.com/lanl/libquo/issues/41))

Add version 2020.10.15, and add variant +dlopen to control overriding
dlopen and dlclose.

* legion: add streichler as maintainer

* gasnet: add maintainers