Add spack packages for tvb-framework dependencies that are not available on spack

See merge request akarmas/ebrains-spack-builds!16

Add new versions to NEST package

See merge request akarmas/ebrains-spack-builds!15

Fix pynn brainscales

See merge request akarmas/ebrains-spack-builds!14

Fix concretization error

See merge request akarmas/ebrains-spack-builds!13

Fix(pynn-brainscales) py-pybind11 had a strange preferred version

See merge request akarmas/ebrains-spack-builds!12

Add pynn-brainscales

See merge request akarmas/ebrains-spack-builds!11

Fix(meta-brainscales): Unpin llvm

See merge request akarmas/ebrains-spack-builds!10

Specify variants for tvb-storage and tvb-framework spec.

See merge request akarmas/ebrains-spack-builds!9

Add tvb-storage and tvb-framework Spack packages

See merge request akarmas/ebrains-spack-builds!8

update to take the appropriate spack env environmental variables without having to list explicitly all the tools

`meta-brainscales` depends on `genpybind` which previously enforced
older versions of `llvm`.

parametrized even more the path that the JupyterLab kernel will be
created

Add(package) meta-brainscales

See merge request akarmas/ebrains-spack-builds!7