TODO:
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v 0.90:
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* improve ML estimation
  - use analytical solutions (if available)
  - use analytical gradient  (if available)
  - exclude 'border' types 0,II,III,V,VII (optionally?)

* use Smith's formula for DDcomplex/QDcomplex divisions

* allow vector-valued parameters for Pearson type IV distributions

* export (and document!) more functions, especially F21

* more flexibility (labels, limits, ...) for pearsonDiagram
