Move regularize anywhere more appropriate

[bvenn]

The regularizeValues function is located in Interpolation.Approximation. While it is currently only used here, it is of bread interest to have this function available on a more global layer. It could be moved to the Seq/List/Array/Vector modules, or to its own source file in the Signal namespace.

Function

Zipping, sorting, aggregating at ties

let xData = [2;2;1;3]
let yData = [8;9;1;4]

regularizeValues xData yData Seq.mean
val it: seq<float * float> = seq [(1.0, 1.0); (2.0, 8.5); (3.0, 4.0)]