* Add a more reliable transient detection mode, and make the mode
selectable using OptionDetectorXXX flags -- the new method is
the default
* Band-limit transient detectors to avoid being distracted by
inaudible garbage
* Add a key-frame mapping facility for variable stretch ratio
management during offline stretches
* Added an initial "formant preservation" option when pitch shifting
* Real-time pitch shifting now uses a faster method by default, with
less variation in CPU usage
* The code is more amenable to compiler auto-vectorization (through
e.g. gcc --ftree-vectorize).
