Update BrainScaleS packages and py-torch
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hxtorch, pynn-brainscales & oppulance) to BrainScaleS current (stable) HEAD.
Amongst other things, this should fix issues with newer py-torch versions ⇒ update py-torch to upstream spack state (0.18.1) and add to spack.yaml; this also requires a newer log4cxx now.googletest headers) of hxtorch and pynn-brainscales by removing system paths from the build-related environment variables for the build of those packages. This was an issue on some sites which add system paths via compiler settings (or other means).spack.yaml (and into the packages or package.yaml, whatever fits better).oppulance).