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 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

Dependency on py-pybind11 now "open" interval… (i.e. later than 2.6.2
allowed for newer version of pytorch).

(Before we somehow used the runtime dependency on py-pyyaml.)

limited the version selection for the package, updated image pull
policy for the build job in the okd cluster and updated information
for releases