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  when evaluating.

* calc/calc-units.el (math-conditional-apply, math-conditional-pow): 
  New function.
  (math-logunits-add, math-logunits-mul, math-logunits-divide):
  (math-logunits-quant, math-logunits-level): Use
  `math-conditional-apply' and `math-conditional-pow' to evaluate 
  functions.
  (math-logunits-level): Extract units from ratio.