tests split off from scipy package in conda-forge

Hi all,

This is an FYI that in conda-forge, thanks to the hard work of @h-vetinari
[1], the `scipy` package now no longer contains tests. Instead, those are
split off into a new `scipy-tests` package which, when you install that,
puts all the test files back inside the `scipy` package tree.

The gain of that exercise was a ~30% size reduction, which seems worth it.
We already had plans to do something similar in SciPy itself, by putting
the heavy data files from the test suite under `scipy.datasets`. The gain
of that will be less, probably 15-20% of the total size of wheels
(excluding vendored openblas et al.). The conda-forge packages are a nice
test case - if we receive no complaints from that, it should be pretty safe
to move forward with that plan.

Cheers,
Ralf

[1] https://github.com/conda-forge/scipy-feedstock/pull/184

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