* it no longer takes ssize, which served no purpose apart from
    scolding you if you got it wrong
  * changed the order of the three remaining required arguments
    to (format, channels, rate) to match the order in which they
    must be set
  * replaced the optional argument 'emulate' with 'strict': if strict
    true, and the audio device does not accept the requested sampling
    parameters, raise OSSAudioError
  * return a tuple (format, channels, rate) reflecting the sampling
    parameters that were actually set

Change the canonical name of ossaudiodev.error to
ossaudiodev.OSSAudioError (keep an alias for backwards compatibility).

Remove 'audio_types' list and 'n_audio_types' (no longer needed now that
setparameters() no longer has an 'ssize' argument to police).