Query: History connectors sources of a given transitionPurpose: Returns the history connectors that are sources of transitions in the input liststm_r_cn_source_of_tr (stm_list in_list,
int *status);
Query: Termination or history connectors targets of a given transitionPurpose: Returns the termination and history connectors that are targets of transitions in the input liststm_r_cn_target_of_tr (stm_list in_list,
int *status);