KERML_ — subsets of scalarQuantities should be nonunique

Sorry, wrong taskforce. The issue should be closed no change.
scalarQuantities is defined as nonunique. However some of its subsets are not. They probably should be nonunique.

Examples:
width, height or gaugePressure

Also many don't have multiplicity [*]. As far as I know, this would not be necessary, because it is the default for attributes defined at package level anyway. However, length and scalarQuantities itself do have an explicit multiplicity. I guess it should be consistent.