WEIGHT-A-FN is a flag or parameter.
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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