The default displayFields method displays all visible, non-editable fields
(i.e., those with fixed contents). The word "display" is used in this section to mean "sent to the serial port for the user to see."
The name is displayed first, followed by a colon, followed by the contents of the field. The serial port XCMDs take card of auto-wrapping long lines.
If a field is declared to be "long", by placing "-- long" in its script, a carriage return is inserted between the name and the contents. The body of a message is an example of a long field; most fields are short.