Multi threaded filling of per pixel histograms for example for detector calibration
1. PixelHistogram - Generic variant expects already pedestal subtracted
data
2. PedestalTrackingHistogram - Terrible name, useful class. Keeps it's
own pedestal and does conversion and pedestal tracking in the worker
threads.
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Co-authored-by: Lars Erik Fröjd <froejdh_e@pc-jungfrau-02.psi.ch>
Erik Fröjdh