Comment ; unreferenced not ; unused on various unreferenced dbs/dws

[Rangi42]

Sometimes a db or dw will be floating around, between actual functions/data, totally unreferenced. We've had a convention of commenting ; unused on these, but ; unreferenced would be more accurate.

Note that some of these are sort of referenced, e.g. when they're in the middle of a data structure or table, and some code does depend on them being there.