OstapHEP/ostap: v1.4.8,2

v1.4.8.2 New features Modify Ostap::Models::BWI::evaluate (temporary action, to be properly fixed in the future) Fix toys.make_toys for possible memory leak (thanks to Abdul-Kerim Gusseinov for repoting the problem and for solution) Add bufstrat argument for Convolution and Connvolution_pdf add more functions isuint, isulong , islonglong , isulonglong more operations with TMultiGraph add graph_summary update graph_summary to add colored bands for "averages" ` replace ROOT.Double with ctypes.c_double graph_summary : add labels and type Graph graph_summary : rename classes, remove TMultiGraph and add documentation` rewrite ostap.math.linalg : more functions & mixed operations: S/T-matrices/vectors&numpy Backward incompatible changes Bug fixes: fix limits for right variable for PSRight_pdf(thanks to Tatiana Ovsiannikova for reporting the problem) fix pdg_format for certaint cases fix missing name attribute for Sum1D/Sum3D clone machinery fix some bugs in graphs.py more bug fixes in graphs.py fix Flatte_pd