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Executive Summary: now prefer option 1 3 below, which feels like the simplest, although not highest performance.

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- valerio: drp communicate with multiple python processes
- mona:
  o routines to modify dgrams from python
    - look at dgramCreate.pyx
      https://github.com/slac-lcls/lcls2/blob/master/psana/psana/peakFinder/dgramCreate.pyx
      also the test test_py2xtc.py
      goal: receive the raw-dgram, and return a fex-dgram with the raw (how do we do this return?)
      data removed (almost always) and put in fex data.
  o think about calib-fetch scaling (lower-priority)
    - ideally independent of mpi. zmq approach? how do we
      determine "supervisor"?