deadair 0.74.0

• A persona can now be set to always work one fact about the music into every link ("How much they lean on what the station knows" → Always). The station picks the fact, preferring a sourced one about the record coming up, and the presenter says it in their own words beside their usual patter.
• A persona can now be set to never be handed what the station knows about the records ("How much they lean on what the station knows" → Never). Its links are written from the records alone, and the facts it is not shown stay unused for whoever presents next.
• A persona can now be set to work one fact about the music into a link now and then ("How much they lean on what the station knows" → Sometimes): about a third of its links carry one, chosen by the station, and the rest carry none.
• The station now records, for each break written by a presenter asked for one fact, whether the script actually said it, so how often a host uses the fact can be read from the break history.