Fix oppulance caching behavior

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!151

Previously, we used a custom do_fetch() to download some additional files
needed for the build and to prepare the build folder.
Now, we use spack to track all resources (i.e. download the additional files
itself) and only setup the build folder in install().

Re-try "Update BrainScaleS-2 to latest HEAD"

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!150

This reverts commit 674e26c0

This reverts commit 017e5e23

This reverts commit 595d9443

Update BrainScaleS-2 to latest HEAD

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!149

Introduction of the mmcif-pdbx Python library

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!145

Add conflict statement to sda as suggested

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!144

Update package.py of apbs to fix runtime error

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!143

Disable debug symbols in pynn-brainscales & hxtorch to reduce disk space consumption

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!138

fix hxtorch, again

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!136