[m-rev.] for post-commit review: --show-definitions

[Zoltan Somogyi]

I wrote this to help me break up mercury_to_mercury.m,
and it has proven quite useful in that task. (I will mail that diff shortly.)

The code itself is quite simple. The only thing that needs reviewing
is whether the option is generally useful enough to document
publically.

Zoltan.
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