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

[Zoltan Somogyi]

For review by anyone.

I am seeking opinions on the name of the new option,
which generates reports such as the ones attached,
and on its documentation. Once we have consensus
on that, I will update doc/reference_manual.texi,
and also NEWS.md if people think this is a good idea.

Zoltan.
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