create new experimental release

added 72 commits

• 407893ff...26563f6b - 29 commits from branch experimental_rel
• 26563f6b...614e18d8 - 33 earlier commits
• 6eae17d3 - fix(bazel): build on ju{suf,reca}
• 060418d0 - fix: check if env is complete before fetching
• fdce79f0 - fix(py-pynn): Dependency on py-setuptools@61:
• f9f6a68c - feat(BSS2): add new versions for next release
• b10c48cb - feat(BSS2): enable latest versions
• b3bff1f3 - fix(BSS2): more adapting of pynn-brainscales to PyNN@0.12
• 8f57a0e6 - feat(BSS2): enable new pynn-brainscales
• b31d1407 - feat(BSS-2): fail build_test if fails are found
• 08973cac - feat(bss2): support for "incremental experiments"
• 108ba76e - feat(bss2): enable new version

Compare with previous version

merged