[m-rev.] for review: show cliques in mdb stack traces less obtrusively

[Zoltan Somogyi]

For review by anyone.

The suggestion that this diff acts upon is Peter's, and it is
from 2012, so better late than never.

The diff includes debugging output that shows the boundaries
of cliques, to make the correctness of the updated output easier
to see. I intend to delete these before commit.

Zoltan.
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