Fix and simplify pqval (physical-quantity) for non scalar-dimension
There was an error in #'pqval when the argument was a non scalar-dimension grid. This has been fixed by moving the binding of 'units into the then clause of the if (it wasn't used in the else clause anyway, and that's what caused the error). The units construction for non-scalar dimension makes use of grid:map-grid and is simpler.
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