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Non-limber integration for two-point angular c_ells #504

@chrgeorgiou

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@chrgeorgiou

Firecrown currently does not support non-limber integration, which is a feature of CCL:

https://github.com/LSSTDESC/CCL/blob/4aa9c0b445f089f9549ba1d210ef3e3357d8cc7b/pyccl/cells.py#L17

This could be included relatively easily in Firecrown by updating the Modelling tools __init__ to include the l_limber float as an input variable and also change accordingly the cached_angular_cl and calculate_angular_cl functions.

I am working on a PR for this. Some help could be needed in making sure this works with the CCL Factories.

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