 1. fix serialisation for `Ostap::Functions::FuncTHND` and `Ostap::Functions::FuncRooTHND` objects
 1. fix serialisation for `Ostap::Functions::FuncTHND` and `Ostap::Functions::FuncRooTHND` objects

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