(copy_conference): Fixed a memory corruption problem that was
introduced when Local_to_global was introduced. (copy_person): Likewise. (copy_text_stat): Added a const qualifier. Rewritten to decrease the probability that the same kind of bug is introduced here, that is, assign each field separately instead of assigning the entire struct at once. (copy_aux_item_list): Now static. Rewritten as above. (coy_aux_item): Added const qualifier. Rewritten as above.