OstapHEP/ostap: v1.5.0.2

v1.5.0.2 New features 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" add methods to create Ostap::Math::ChebyshevSum from Ostap::Math::ChebyshevApproximation Backward incompatible changes Bug fixes: fix a bit strange "feature" with "derived" variable in RooDataSet (thanks to Alexander Artamonov for rereporting). It happens that RooDataSet::addColumnRooDataSet::addColumns` behave a bit differently. the first one issues the error message and variable behaves weirdly