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WIP: Implement CatalogMesh as a view of CatalogSource #393
The old CatalogMesh was unclear about who owned the columns, with unusual side-effects when adding columns directly to a mesh. This PR aims to implement CatalogMesh as a view of a CatalogSource object, similar to the numpy "view". This also implements slices of CatalogSource objects as views as well.
Okay I re-worked some of the logic to make more sense now.
Let me know what you think @rainwoodman -- I think this is ready for merging soon