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Matt writes: The coupled deadtime idea didn't work.  So, this should make the transition respect deadtime per readout group (some might get it and some might not).

Mona writes about psana2: eventbuilder requires that all non-L1 have to be complete (i.e. all streams need to see SlowUpdate).  This suggests to cpo that we need to eliminate the 0x80 bit and set xpm-pause_threshold low enough that we always guarantee at least one SlowUpdate can be received by all detectors.  Matt agrees with this, but points out that the system must drain that SlowUpdate before another is sent down.

Brainstorming

Issue: SlowUpdate currently preempts L1Accept, so integrating detectors miss their normalization data

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