checkInputs used to be added to nativeBuildInputs. Now we have
nativeCheckInputs to do that instead. Doing this treewide change allows
to keep hashes identical to before the introduction of
nativeCheckInputs.
There's a bit of LaTeX math code in a comment in a test file:
```
.. math:: L = 10 \cdot \\log_{10}{\\left(\\frac{MS}{p_r^2} \\right)}
```
which of course should be `\\cdot`.
I could patch it, but I think skipping deprecation warnings in tests is
probably ok... (If nothing else it's easier.)
The `buildPython*` function computes name from `pname` and `version`.
This change removes `name` attribute from all expressions in
`pkgs/development/python-modules`.
While at it, some other minor changes were made as well, such as
replacing `fetchurl` calls with `fetchPypi`.
