gFEX input ByteStream decoder update
This MR includes some updates of the ByteStream decoder of the gFEX input to reflect some changes in the firmware or to fix known bugs in the fibers-to-gTowers mapping. The required changes are documented here: https://its.cern.ch/jira/browse/ATLGFEX-124. In particular, the MR includes:
- Updates of the TREX and FCAL mapping
- Use of the left shift for truncation rather than division
- Definition of separate arrays for gTowers of 50 MeV (to be used in the pile-up correction calculation), and gTowers of 200 MeV (default, used by the algorithms)
- Definition of a new container for the 50 MeV towers
- Changes for saving the saturation bit