Extra stats to compute

[dfm]

• [ ] Second highest peak at each period and/or 0.5*phase
• [x] Even/odd depths at 2*period
• [x] Number of points in transit
• [x] Number of distinct transits
• [ ] Number of points in neighboring bins
• [ ] Trapezoid fit at the peak (allowing period, epoch to vary)
• [x] (Fractional) chi2 contribution from the minimum chi2 transit
• [ ] Inverse transits - something like the peak chi2 for -depth transits, or maybe full inverse periodogram
• [x] Add checks for positive depth when optimizing over phase
• [ ] Signal to pink noise (https://arxiv.org/abs/1605.06811, Eq 15 - missing sqrt)