Fix safe division in f-k #14
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Modifying the last division in f-k seems to denoise a bit the results. The division was intended to be a safe op instead of selecting the maximum value of sqrt_term (https://github.com/computational-imaging/nlos-fk/blob/d34d49fed5a86f4ebddf85d461cff6923de5367d/cnlos_reconstruction.m#L79). Also, the commit includes downsampling in f-k.
The following images compare the changes (left, "fixed" version; right, current one):