* py-gpaw: Fixing missing numpy include path, adding newer version of py-gpaw and fixing a bug with libxc.c in older py-gpaw
* py-gpaw: Fix Python and ASE version dependencies
- GPAW 19.8.1 requires Python 3.x, add dependency on python@3.5:
- GPAW releases are associated with a corresponding ASE release, add
matching ASE version dependencies.
* py-gpaw: Enable the scalapack variant by default
GPAW installation instructions say scalapack is optional but "highly
recommended". Thus enable it by default.
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