getIndexOfExcludedEntry is an internal function for
converting item IDs to item indices for exclusion.
getIndexOfExcludedEntry(exclude, constraints)getIndexOfExcludedEntry returns a length-nj list in the same structure,
with its contents converted to item indices.
a length-nj list, where each entry is a named list containing:
i item IDs to exclude for this examinee
s item set IDs to exclude for this examinee
a constraints object representing test specifications. Use loadConstraints for this.
Notation:
nj the number of examinees