* More work on framing, interpolation and scaling for longer window than FFT size.

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.

src/StretcherChannelData.h

@@ -104,6 +104,8 @@ public:
     float *accumulator;
     size_t accumulatorFill;
     float *windowAccumulator;
+    float *interpolator; // only used when time-domain smoothing is on
+    int interpolatorScale;
 
     float *fltbuf;
     double *dblbuf; // owned by FFT object, only used for time domain FFT i/o