[m-rev.] for post-commit review: use error_specs in handle_options.m

[Zoltan Somogyi]

The rationale for this diff is that the code that selects the op_mode
uses error_util too. We agreed that we should select the op_mode
as part of option processing, and this prepares for that by eliminating
a difference that would complicate the review of the diff that does
that merge.

I was going to move that code to handle_options.m, but I think
it would be better to move it to a new module (I propose op_mode.m.),
and also move the code currently in handle_options.m that computes
the grade and handles the implications of grades to another new module,
named (say) compute_grade.m. Any opinions, or objections?

Zoltan.
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