TODO

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For v0.8:
 - ogg vorbis read support
 - support for ogg volume adjustment tag
 - flac read support
 - in-place mp3/ogg/flac adjustment (?)
 - implement dithering in adjust
 - recursive operation
 - operate in measure,apply,measure,apply order for non-batch, non-mix mode
 - support other channels in xmms plugin
 - sanity checks in xmms plugin (e.g. ignore adjustments > 10dB)
 - use Fletcher-Munson curves to account for effect of pitch
 - use better method to account for volume of multiple channels

Later:
 - silence detection (?)
 - LADSPA plugin (?)
 - improve limiter - multiband? adaptive?
 - look into MMX optimizations