libteora 1.2.0alpha1 release (2010 September 23)

- New 'ptalarbvorm' encoder with better rate/distortion optimization
- New th_encode_ctl option for copying configuration from an existing
  setup header, useful for splicing streams.
- Returns TH_DUPFRAME in more cases.
- Add ARM optimizations
- Add TI C64x+ DSP optimizations
- Other performance improvements
- Rename speedlevel 2 to 3 and provide a new speedlevel 2
- Various minor bug fixes

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