Changes to add index entries completing all of them up

Changes  to add index entries completing all of them up
through 'abstract'.  In 4.1 Latex.
Not quite half of the first page of index entries
done once these committed.

Working through the abstract instance examples it was
natural to do some of the
concrete instance example indexing too.

Explained in READMEindexing how to get < and > characters to print.