gFEX pileup threshold update
This MR introduces the following changes:
- Update the threshold used to calculate the pile-up correction (energy density rho)
- Update the truncation and overflow for the gFEX SumEt in the ByteStream decoder
- Remove the sign extension for rho in the gFEX Jet EDM (not needed because rho is always positive)
Edited by Cecilia Tosciri