OstapHEP/ostap: v1.9.8.4

v1.9.8.4 New features: add new example on making p-value scan (thanks to Dima Golubkov) Fix FrequentistsCalcualtor and HybridCalculator to use cloned datasets. (They can destriy/corrupt input dataset). Clone ddatatsets are deleted after usage simplify interface for P0Plot.fill ostap.utils.utils : add CRange and crange - helper utilities to generate range of values between vmin and vmax according to Chebyshev nodes add z1,z2 variables (and corresponding transformations) for Ostap::Kinematics::Dalitz0/Dalitz classes add functionality to generate (weighted) x1/x2 and z1/z2 distributions for Dalitz configurations add s2x and s2z methods for Ostap::Kinematics::Dalitz0/Dalitz classes for better unificaton of interfaces add more tests for Dalitz(z1,z2) mapping Backward incompatible: remove use_onesided argument from AsymptoticCalculator constructor Bug fixes