[m-rev.] for possible post-commit review: put optdb clauses in order

[Zoltan Somogyi]

What is worth reviewing is not this diff, which just moves things around,
but the updated version of tests/warnings/help_text.err_exp, the new help text.
However, I will propose more changes to that over the next few days, so you
may want to hold off.

Zoltan.
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