Query: History connectors sources of a given transitionPurpose: Returns the connectors that are sources of basic a-flow-lines in the input liststm_r_cn_source_of_ba (stm_list in_list,
int *status);
Query: Termination or history connectors targets of a given transitionPurpose: Returns the connectors that are targets of basic a-flow-lines in the input liststm_r_cn_target_of_ba (stm_list in_list,
int *status);