Loading the libEnsemble module should auto-load the correct dependent modules

[shuds13]

This is a special Python (or interpreted languages) issue in Spack as compiled packages use rpaths.

This can currently be accomplished by loading the Spack module with:

spack load -r py-libensemble

Or on some platforms by having a correct modules.yaml file present in $HOME/.spack/. It would be preferable if this automatically happens when the module is loaded using "module load". This may requires using Spack views.

https://spack.readthedocs.io/en/latest/command_index.html#spack-view

However, I have not as yet managed to get this to work for the libensemble package.