General:

* dsputil-ize code in dependent_coupling() and output_samples() as appropriate
* Swap scale_bias values for C/SIMD and multiply by scale_bias as appropriate
  rather than divide

Cosmetic:

* Find unusually capitalized keyword phrases and add abbreviations in
  parentheses e.g. Temporal Noise Shaping (TNS)
* Break lines over 80 characters as appropriate
* Add notes regarding what FAAD supports that we don't
