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like a "locally generated occurrence" (babar synchrequest from 1 ROM)

downsidedownsides:
- a multisegment detector couldn't write out slowupdate all on the same timestamp

- non-backwardly compatible change: old data has event-build slowupdate, new data
  doesn't (could use a different transitionid?)

- lose ability to do global operations e.g. in shared memory

changes required:
- remove slowupdate generation from control.py
- change epicsarch to do the L1/SU generation
- mona changes the psana broadcast of SU in some sort of backwardly compatible way
- ric intuition: drp executable significant changes? EbReceiver?