Eliminate misleading precision in the bpm and rate displays.
* Show only one decimal place for bpm and rate
* Waveform stretch reacts more slowly to small changes in rate.
* Vinyl control bpm updates are much more sticky.
Reduce redundant subtraction
Have WNumbers the NumberOfDigits parameter and set a default of 1 decimal.
Show two places by default
Don't smooth waveform stretching.
Merge pull request #149 from ywwg/rate-ui-smoothing

Eliminate misleading precision in the bpm and rate displays