Version 0.5.3:
   * trap_send() & trap_recv()
   * force flush of output IFCs on finalize
   * PAGER for help (use e.g. export PAGER=less)
   * bugfixes:
      - init and finalize
      - removed recovery limit
      - delete of old unix socket
      - service thread close
Version 0.5.0:
   * context libtrap API
   * service interface for supervisor
   * function for buffer flush
   * constant text string with libtrap version
Version 0.4.4:
   * max number of clients is optional IFC parameter (in -i)
   * using autools
   * autoflush
