OstapHEP/ostap: v1.9.9.0

v1.9.9.0 New features: improve and simplify test_tools_chopping tiny adjustment of printout format for class Ostap::Math::ValueWithError hide explicit manipulations with Ostap::FormulaVar into new function make_formula add alias methods/properties for CB2_pdf improve a bit drawing of combined signals/components/backgrounds add more drawing options, draw_order, draw_singals, draw_corssterm1 , draw_crossterm2,draw_components,draw_backgrounds` Backward incompatible: Bug fixes: Fix typo for treatment of minos argument for PDF.fitTo metho