Implement SigmaG filtering in JAX #750
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Change the numpy vectorized implementation of sigma G filtering to use JAX and vmap. This produced roughly a 2000x speedup on sigma-G filtering on timing tests on Baldur.
Also makes one behavior change. Previously sigma-G filtering with clipped_negative=True would filter out zero values of LH (but NOT all negative values). This does not make sense with the goal of sigma-G, so I have removed it.