v1.12.0.0

v1.12.0.0

New features

1. Add estimators for harmonic, geometric, power & Lehmer means and their weighted analogues
2. Reduce code duplication
3. Large redesign of staistics/projection& othe rmethids for RooAbdData/TTree/DataFrame
4. Large redesign if statvars.py module
5. Add roc_curve for making ROC curves, and corrresponsing test module
6. Add eff_graph for 1D historgams for creation of the efficiency graph
   from the 1D-distribution.
7. Some tweaks for moments & counters
8. Activate a new draw method (via tree_draw) for ROOT.TTree
9. add progress and report optioal argumens for (almost) all Frame-related functions
10. Some tweaks for style configuration
11. update ostap.utils.valerrors & and new test
12. allow to use width keyword when line_width is not specified for XXX.draw method
13. add loop methdod for RooAbsData and implement rows in terms of loop
14. allow more recusion in vars_and_cuts function
15. add new test
16. make progress bar silent if not isatty() unless explicitely set silent=False

Backward incompatibl

1. project(&draw) for 2 and 3-dimession now follows the natural order of varibales:
   XX.project ( target , 'x,y,z' , ...)
2. For eff & effic' and efficinecy methods fo r1D histograms
   the confusing optional argument increasing=True is replced by (less-confusin)
   cut_low and the argument is not optionl anymore
3. From now for weighted datasets dataset[i] returns (entry,weight) tuple
4. from now iteration over weighted dataset gives (entry,weight) tuple
5. change sinature of dataset.loop , dataset.rows methods to return triplets index, entry, weight

Bug fixes

1. fix a typo in ostap.ploting.canvas