[Vorbis] "aoTuV" beta6 was released

[Aoyumi]

I released "aoTuV" beta6 of OggVorbis encoder, library.

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CHANGES (for general) from beta5.7
  # Libvorbis aoTuV was unified with Xiph.Org's libvorbis1.3.2.
   # Pre(post)-echo of the specific pattern was improved.
   # The bit allotment when sound of the different type coexisted was improved.
   # The calculation method of dynamic thresholds of the stereo mode was changed.  This is more effective than former method.
   # The part of the noise normalization processing was changed.  As for this change, more correct audio energy control and reduction of the ringing are formed in the low bitrate.
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Enjoy

Aoyumi