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1. Simplify interface for
Ostap::Math::Integrator
and `Ostap::Math…
…::DalitzIntegrator` classes: essentially remove large duplication, the tag/label argumetn for caching is now the last one and "optional" 1. add methods to create `Ostap::Math::ChebyshevSum` from `Ostap::Math::ChebyshevApproximation` 1. fix a bit strange "feature" with "derived" variable in `RooDataSet` (thanks to Alexander Artamonov for rereporting). It happens that `RooDataSet::addColumn`RooDataSet::addColumns` behave a bit differently. the first one issues the error message and variable behaves weirdly.
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