This reverts merge request !87

Update PyNN

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!87

Added biobb-md

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!93

Fix py-torch: Enable tensorpipe

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!96

Add py-frites

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!97

Add py-viziphant

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!91

Add py-elephant

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!90

Add py-neo

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!86

Add py-quantities

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!85

Importing torch yields an ImportError caused by some mismatch between
build options (distributed is enabled, but tensorpipe is not →
this seems unsupported → enable tensorpipe).

Related to: https://support.humanbrainproject.eu/#ticket/zoom/14319

Fix oppulance: Explicitly depend on modern flex version

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!95

Fix oppulance

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!94

If starting from scratch the archive file isn't there in do_fetch;
in this case, we can make use of the folder where the freshly
downloaded resources are cloned to.

Add oPPUlance (the SDK for the embedded processors (aka PPUs) on BrainScaleS)

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!73

Add py-neo, which is a dependency for py-elephant and py-pynn. An older version is available in upstream Spack.

Add py-quantities, which is a dependency for py-neo. This same version is available in upstream Spack, adding it here in case we need to add new versions quickly