[m-rev.] for review: don't emit msgs when creating interface files

[Zoltan Somogyi]

The diff is mostly straightforward, but I am seeking people's opinions
on three things.

First, does anyone object to delaying messages about unexpected items
in interfaces, or the absence of items in interfaces, until code generation time?

Second, does this change warrant an entry in NEWS?

Third, would anyone object to a later change that puts all checking
of whether an item belongs in a given section of a given file into one place,
parse_module.m?

Zoltan.
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