[12gevmoller_sim] [JeffersonLab/remoll] fb5e58: Save pid in sum.by_pid.pid ROOT branch.

[Wouter Deconinck]

  Branch: refs/heads/bugfix-save-pid-in-sumsbypid
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  Commit: fb5e5808fb4ea83ae2f80c120f29a71968dd0d29
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  Author: Wouter Deconinck <wdconinc at gmail.com>
  Date:   2019-03-12 (Tue, 12 Mar 2019)

  Changed paths:
    M include/remollGenericDetectorSum.hh

  Log Message:
  -----------
  Save pid in sum.by_pid.pid ROOT branch.

After the sum.by_pid functionality was changed to internally use
branches, I forgot to store the pid (std::map.first) in the vectors
that are written to the ROOT tree. All values of pid were still at 0.