[m-rev.] diff: improve list.m

[Zoltan Somogyi]

The diff itself is uninteresting, but it does raise a question. Since
nth_member_search is identical to index1_of_first_occurrence,
and nth_member_lookup is identical to det_index1_of_...,
should we mark the former as obsolete? (Marking the latter
as obsolete would not make sense, since they have index0 versions
as well.)

Zoltan.
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