Scale up number of galaxies

[aimalz]

chippr needs to be able to obtain posterior samples of n(z) for catalogs of ~1 million galaxies and will need an infrastructure overhaul to do so. In particular, multiprocessing will have to happen at the level of inference, not just in wrapper scripts for tunning different test conditions.

[aimalz]

This is proving to be a serious problem. I don't know the right way to change the CosmoLike parameters lmin, lmax, 'Nl, area, and n_gal` to bring down the number of galaxies without violating consistency with the n(z) I'm using.