window already (#25). Also avoid using alloca for substantial buffers
* Lose FFT::getFloatTimeBuffer and getDoubleTimeBuffer -- it's too
unclear when it's safe to use them and it's safer to control sizes externally.
In RB with smoothing on, these buffers were incorrectly being used for window-si
zed calculations (larger than FFT-sized).
* Fix some incorrect buffer resize sizes
* Build fixes for OS/X
* 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
