C2MS11 — In message tables, rework the "value" column to allow for fixed values vs. default values

Many fields in many messages contain value information. Some of the values are defaults and some are intended to be constant. Also, this information is in the "notes" column. There should be a way to differentiate between fixed and default values more easily than reading the notes fields. Also, this will make encoding those attributes in the .xsd PSM easier.