[m-rev.] for post-commit review: gap_foldl, last_gap_foldl, and chunk_foldl[1-4]

[Zoltan Somogyi]

The concepts have been agreed before and the implementations
are straightforward, so what remains to be reviewed are the
predicate names, their descriptive comments, and for the chunk_fold
predicates, the selection of modes. I provided modes in which
- all accumulators are in,out
- the last accumulator is di,uo, and
- the last two accumulators are di,uo.
In my experience, these are enough.

Zoltan.
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