libraw1394 v2.1.1 release

- Fix backwards moving cycle timer in isochronous transmit.
  The problem has been observed with audio I/O on different systems.
- Fix crash with SIGBUS on SPARC and similar architectures.
- Fix memory leak in address range mapping response handler.
- Fix errno reporting to applications which relied on behavior of
  libraw1394 1.x.
- Fix errno checking in the dumpiso and sendiso example programs.
- Minor documentation improvement.
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