v3

Release v3. Added features and implemented fixes follow.

• Make each JSON message timing data start with window size.
  This makes it possible to pick up the stream from any message and also
  combine messages, with window size known and preserved at all times.
• Add "term" field to JSON messages, specifying terminal type.
• Add "ver" field to JSON messages, specifying message format version.
• Set "SHELL" environment variable to actual user shell in tlog-rec.
• Check for locale's charset and abort tlog-rec if it's anything but the only
  supported UTF-8.
• Add -v/--version option support to tlog-rec and tlog-play.
• Fix tlog-rec and tlog-play error output by accumulating error messages and
  outputting them only after terminal settings are restored, on exit. Output
  startup warnings before switching to raw terminal settings.
• Output a newline after restoring terminal settings in tlog-rec and
  tlog-play, so that following output is not stuck to the end of the last line
  of the raw output.
• Add an Elasticsearch mapping to documentation directory.
• Disable input logging by default to avoid storing passwords. Please enable
  it explicitly in configuration, or on the command line, if necessary.
• Close log file written by tlog-rec on executing the shell in the child to
  prevent log modification by the recorded user.
• Support running tlog-rec SUID/SGID to prevent recorded users from killing or
  modifying it. Make tlog-rec SUID/SGID to user "tlog" in the RPM package.
• Add session locking to tlog-rec. This prevents tlog-rec from recording if
  the audit session is already recorded by creating per-audit-session lock
  files in /var/run/tlog. This only makes sense with tlog-rec SUID/SGID.
  When certain failures occur while creating a lock file, session is assumed
  unlocked and is recorded anyway, as it is safer to record a session than
  not. Add corresponding setup to the RPM package.
• Reproduce the recorded program (shell) exit status in tlog-rec similarly to
  how Bash reproduces the last executed command status.
• Update and expand README.md to describe secure log message filtering with
  rsyslog, and playback directly from Elasticsearch, among other, smaller
  additions.