(prot_a_output_person): Adjusted to the fact that the created_texts
member of Person is now a l2g. (prot_a_output_conference): Adjusted to the fact that the texts member of Conference is now a l2g. (prot_a_output_conference_old): Likewise. (prot_a_output_l2g_iterator_as_text_list): New function which emulates a Text_list.
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