std::unique_ptr< SourceTerm > createPythonSourceTerm(BaseLib::ConfigTree const &config, MeshLib::Mesh const &source_term_mesh, std::unique_ptr< NumLib::LocalToGlobalIndexMap > dof_table, int const variable_id, int const component_id, unsigned const integration_order, unsigned const shapefunction_order, unsigned const global_dim, std::vector< std::reference_wrapper< ProcessVariable > > const &all_process_variables_for_this_process)