When a library wants to configure transitions between patron categories using the update_patrons_category.pl cron, all of the parameters for this must be entered on the command line. We should put the power to configure this in the hands of the library, and allow configuring these transitions in the Patron Category editor within the interface. We'll still need the cron of course, to do the actual shifting, but how cool would it be to have one job that checks the categories preferences and does the work without needing several job definitions.