Bridging with actsims

[msyriac]

We need to do a full verification of the pipeline, starting from simulations of ACT lensing maps, generating correlated galaxy density fields, getting final bandpowers and ending with cosmology constraints.

This means we need to generate GRFs correlated with the ACT lensed sim kappa maps, and Poisson sample galaxy catalogs with them. The pieces are in place, but some glue code needs to be written.