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Update eta correction to 2-pixel unit cell

Morag Williams requested to merge williamm/corryvreckan:update_eta_correction into master

Updating the eta correction method to use a 2-pixel unit cell.

For each cluster, the largest pixel col/row value is found and used as the center of a 2-pixel unit cell spanning (-pitch, pitch). The track intercept and calculated cluster center position are compared within this unit cell, creating 2D and TProfile histograms of cluster position vs. track intercept.

This method takes into account effects at the pixel edges when the cluster center and associated track intercept are in different pixels. Tested on CLICpix2+planar DESY data.

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