Log Message:
Update to 1.0alpha6:

libtheora 1.0alph6 (2006 May 30)

 * Merge theora-mmx simd acceleration (x86_32 and x86_64)
 * Major RTP payload specification update
 * Minor format specification updates
 * Fix some spurious calls to free() instead of _ogg_free()
 * Fix invalid array indexing in PixelLineSearch()
 * Improve robustness against invalid input
 * General warning cleanup
 * The offset_y member now means what every application thought it meant
   (offset from the top). This will mean some old files (those with a
   non-centered image created with a buggy encoder) will display differently.