[m-rev.] for review: {err,warn,info}_spec

[Zoltan Somogyi]

For review by anyone.

The diff is huge and boring. The only parts I am seeking feedback on
are the parts marked by "XXX DIAG_SPEC" and a comment. The parts
marked by "XXX DIAG_SPEC" without a new comment are reminders
to myself about minor changes to do after this diff is committed.

Zoltan.
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