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Store proximity to nearby peaks

Luca Scotto Lavina requested to merge peak_proximity into master

Created by: JelleAalbers

This renames NCompeting to PeakProximity, and adds fields for the time to the nearest, previous, and next peak.

This would make selecting isolated peaks a lot easier (e.g. for single electron studies @Jianyu010):

df = st.get_df(run_id, ['peaks_basics', 'peak_proximity'],
               selection_str='t_to_nearest_peak > 10e3')

The t_to_nearest_peak etc. fields have a (configurable) maximum value of 1 second. So if a peak has no other peaks within 5 minutes, t_to_nearest_peak will still be 1 second. This limits the amount of lookback/lookahead we need to do, which is good for online processing.

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