Determines what print-herald prints (the system startup banner.) This is a database which can be augmented by each loaded system. The format is a property list which maps from subsystem names to the banner information for that system. This list can be manipulated with getf -- entries are printed in, reverse order, so the newest entry is printed last. Usually the system feature keyword is used as the system name. A given banner is a list of strings and functions (or function names). Strings are printed, and functions are called with an output stream argument.