[m-rev.] for review: replace some rafe-isms

[Zoltan Somogyi]

For review by anyone.

The only tricky part is the replacement of ... ^ elem := ...
by det_insert operations. These are clearly ok immediately
after a failed search, but some of them are after a failed search
and then some other operations that shouldn't, but theoretically could ,
add that key to the relevant map.

Zoltan.
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