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Cluster: add function to retrieve earliest pixel + split getSeedPixel()

Jens Kroeger requested to merge get_earliest_pixel into master

This MR is in preparation for an improvement of the timewalk correction:

Before:

  • Clustering4D: cluster timestamp = earliest pixel (or largest ToT)

  • Timing Analysis: timewalk correction based on seed pixel, but seed pixel = largest ToT ≠ cluster timestamp

Now one can retrieve both from the cluster:

  • getSeedPixel() -> pixel with largest charge (or earliest pixel if no charge available)
  • getEarliestPixel() -> pixel with earliest timestamp
Edited by Jens Kroeger

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