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Update LATOME data compression to match current scheme

Alan Watson requested to merge watsona/athena:r22-eFEX-compression-update into 22.0

Simulation of the eFEX starting from supercells requires including the effects of the compression and decompression of ET values by LATOME. The compression scheme has changed since the simulation was originally written, so this request updates to the current version.

The effect is modest: it improves resolution very slightly for supercells within the ET range of interest for the eFEX. There will be an increase in overflows as the maximum cell ET is reduced, but any cell with ET > 144.8 GeV should be triggering anyway so expect little impact on counts. In any event this is what's being used in the hardware, so needs updating.

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