This MR is needed to ensure strict reproducibility of MDFs. It has no observable effect except for helping the testing in Moore.
- Initialize padding bytes in HltSelRep event model
- Reset packed data checksums on every event (much more useful for testing with streaming).
I also add a script to dump the bytes of the raw events, decompressing the
DstData bank as needed. This can be used to track down differences.
Once ready this should be cherry-picked to master.