Calculate SNR and some bug fixes

• Calculate SNR from power spectrum density additionally.
• Check if resolution fit fails and add nans in those cases to avoid a crash.
• Regularize H calculation to avoid fit failure by setting numerator to zero when it is too small.
• Pay attention to deactivated channels when estimating pedestal to avoid crashing as a result of nonsensical channels.
• Added long notebooks with paper analysis for bookkeeping.