A function that should take an option as argument and

return a value to be used as its weight-a. Currently, the only

such predefined function is EXPANSION-LEVEL-WEIGHT-A, which returns

the expansion level of the option to be used as a weight.

The total weight of a set of options is the weight-a of each option

plus the weight-b of the set plus the weight-c of the set.

WEIGHT-A-FN takes values of type SYMBOL.

It belongs to subjects MS91-7 MS91-6 .

Its default value is EXPANSION-LEVEL-WEIGHT-A

Its current value is EXPANSION-LEVEL-WEIGHT-A.

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