[m-rev.] for post-commit review: the by-example chapter

[Zoltan Somogyi]

For review by Mark. The diff contains XXXs marking questions for you,
and/or places that need to be looked at further.

For Peter & Julien: was there a time when we *formally* supported
ISO 8859-1 characters in strings, or was any such support just
a side effect of support for ASCII strings? I don't remember,
and you guys were much more involved in i18n than I was.

Zoltan.
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