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lisa: Introduce datautils module

Douglas Raillard requested to merge github/fork/douglas-raillard-arm/_pr210 into master

Contains generic helpers for dataframe, series and more generally data manipulation.

  • df_merge replaces concat+sort_index so that both are done in one go, which should be more efficient
  • series_derivate allows working on dataframe columns (Series) easily.

The naming convention of functions is an extension of the one of analysis: prefix functions with the kind of things it operates on (df_, series_ etc).

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