Storage/retrieval for reduced trilegal histograms

[delucchi-cmu]

Create method (or create it in macauff) to reduce the trilegal files into chunked reduced histograms.

We can store as a .npy mapping (ra, dec) -> [histogram].

Create strategy for matching a healpix pixel to the nearest trilegal chunk, represented as the (ra, dec) of the centroid of the simulated zone.

[Onoddil]

This can likely re-use macauff's make_tri_counts function, inside an iteration over chosen ra, dec.

For the first step there is also download_trilegal_simulation here which can be called to download the files in the first place.