This adds the --smoothing option to the command line tool and SmoothingOn/Off
options to the API, introducing a double-length window with presum FFT and
time-domain smoothing. Behaviour elsewhere _should_ be unchanged.
* 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
* Threading fixes (corrections to condition usage)
* Avoid a potential hang when faced with some peculiar stretch factors
* More modular calls out to vectorizable functions
* Solaris build fixes
* Bump version number
