Can be used to record IU event streams to session files, and replay
these session files. The recorder looks mostly like the sniffer, but
also writes to a file. Replay timing is taken from the file, relative
to the first considered event. Automatic retraction is suppressed in
the replay script (only replicating original retractions).

Current limitations:
  - only ADDED, UPDATED, RETRACTED, MESSAGE, COMMITTED (-> TODO links!)
  - (replay script:) uses list of categories, no regex mode so far

Example usage:
 ipaaca-session-record --rsb-host host1 -r -c "asr.*" -o my.session
  [...]  # partial local replay:
 ipaaca-session-replay -c asrresults asrstate -i my.session