KERML_ — subsets of scalarQuantities should be nonunique

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.