v1.9.8.4

v1.9.8.4

New features:

1. add new example on making p-value scan (thanks to Dima Golubkov)
2. Fix FrequentistsCalcualtor and HybridCalculator to use cloned datasets. (They can destriy/corrupt input dataset). Clone ddatatsets are deleted after usage
3. simplify interface for P0Plot.fill
4. ostap.utils.utils : add CRange and crange - helper utilities to generate range of values between vmin and vmax according to Chebyshev nodes
5. add z1,z2 variables (and corresponding transformations) for Ostap::Kinematics::Dalitz0/Dalitz classes
6. add functionality to generate (weighted) x1/x2 and z1/z2 distributions for Dalitz configurations
7. add s2x and s2z methods for Ostap::Kinematics::Dalitz0/Dalitz classes for better unificaton of interfaces
8. add more tests for Dalitz< in parituclar (s1,s2)<->(z1,z2) mapping

Backward incompatible:

1. remove use_onesided argument from AsymptoticCalculator constructor

Bug fixes: