Implement simple analysis function that can be collected as"Smooth" or similar
* Smooth
** Running average (with different weight)
** Savitzky-Golay (see NR)
** Lowess (Loess)
** (Fourier low pass)
* Interpolation
** Polynomial interpolation
** Spline interpolation (Linear, Cubic, Akima, Exponential)
* Calculations
** Differences (forward, backward, center)
** Sum/Integration
* Transforms
** Fourier Transform (direction, normalization, window, etc.)
** Correlation
** Convolution/Deconvolution
* Misc
** Wiener, Kalman filter
** Periodigram (see kst)
** Cross spectrum (see kst)
http://www.originlab.com/doc/Origin-Help/Smooth-Algorithm
https://kst-plot.kde.org/kst1/handbook/plugins-vector-processing.html