Implementation details of analysis functions:
Analysis groups and functions:
* Data reduction (prune) (see xmgrace)
* Differentation (T3766)
* Integration (T3886)
* Smooth (T2391)
* Interpolation (T2171)
* Fourier filter (T2104)
* Fourier transformation (T3088)
* Nonlinear Fitting (T5994)
* Data set operations (T8642)
TODO:
* Auto-/Cross correlation
* Convolution/Deconvolution
* Peak finding/sharpening
* Misc
** Periodigram (we already have Fourier trafo, see kst)
** Cross spectrum (see kst)
** Wiener, Kalman filter