 1. add `reduce` method for polynomial and spline classes  1. largerly rewrite and extend all interpolation stuff  1. more improvemements for serialization of polynomial-like stuff  1. add generic python interpolators with tests for matrices  1. more agressively decorate new instances for linear algebr aclasses  1. add method `shoot` for 1D, 2D and 3D histograms
 1. add `reduce` method for polynomial and spline classes
 1. largerly rewrite and extend all interpolation stuff
 1. more improvemements for serialization of polynomial-like stuff
 1. add generic python interpolators with tests for matrices
 1. more agressively decorate new instances for linear algebr aclasses
 1. add method `shoot` for 1D, 2D and 3D histograms

 1. fix bugs in `tree.py`  (Thanks to Daria Savrina)
 1. fix newly introduiced bug in (python) constructor of bernstein polynomoals

OstapHEP/ostap,OstapHEP/ostap,OstapHEP/ostap,OstapHEP/ostap