Call BibFormat on the fly for all situations, except when creating HB, when the configuration variable CFG_CALL_BIBFORMAT on whether we should do so or not is consulted. This is in accordance with the move to dynamic detailed record pages. Note: when BibFormat on the fly returns XML with FMT tag containing the HTML output format, as suited for the upload of precreated formats, call_bibformat() strips the XML envelope and returns HTML body only using Fred's patch, making it possible to have a mixed precreated/on-the-fly formatting philosophy.