Let's make it official then... recommend max line length 88

SciPy is documented to follow the PEP 8 style guidelines; see

https://docs.scipy.org/doc/scipy/dev/contributor/pep8.html#pep8-scipy

PEP 8 recommends a maximum line length of 79 characters. The degree of care
with which we follow this guideline has varied quite a bit over the years,
and there is currently a lot code where the guideline is violated. Lately,
in particular, the enforcement of this guideline has been relaxed, and
folks seem to be settling on 88 characters as a reasonable maximum. This is
partly a side effect of the replacement of `pycodestyle` in CI with `ruff`;
the default maximum line length in `ruff` is 88. This means new lines of
code with lengths between 80 and 88 are not being flagged in CI. (I don't
recall if CI currently fails with lines longer than 88 characters.)

If everyone is satisfied with a maximum of 88 characters, let's make it
official and update our developer documents to state this explicitly.

What do you say, yea or nay?

Warren

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