Simplify definition of CoherentProductUnit and CoherentRatioUnit

[sa-bpelakh]

Can CoherentProductUnit, currently defined as

    EquivalentTo: 
        gist:ProductUnit
         and (gist:hasMultiplicand only 
            ((gist:BaseUnit or gist:CoherentProductUnit or gist:CoherentRatioUnit)))
         and (gist:hasMultiplier only 
            ((gist:BaseUnit or gist:CoherentProductUnit or gist:CoherentRatioUnit)))

cannot be simplified to

    EquivalentTo: 
        gist:ProductUnit
         and (gist:hasMultiplicand only gist:CoherentUnit)
         and (gist:hasMultiplier only gist:CoherentUnit)

since the definition of CoherentUnit is exactly (gist:BaseUnit or gist:CoherentProductUnit or gist:CoherentRatioUnit).

Similarly with CoherentRatioUnit.

[uscholdm]

DEFERRED: until there is a revision to units and magnitudes in a future major release. #697