v1.9.9.2

v1.9.9.2

New features:

1. add new test for exteding drawing
2. add new method valid_formula that is usefuel for creation of formulas from expressions
3. add helper context manager random_seed
4. add new methods for RooDataSet : unique_entries, duplicates and make_unique to deal with "duplicated" entries (multiple count)

Backward incompatible:

Bug fixes:

1. fix the bug in the H2D_dset and H3D_dset for weighted=True case