Make function private and don't use a different name for it, as it performs the same purpose. Also, it doesn't set anything.

Improve support for standalones MVC++ 9.0/10.0 compilers by setting directly the environment if Vcvarsall.bat is missing or fail.

setuptools no longer provides an upload command.

Rewrite setup/teardown methods as pytest fixtures, encapsulating concepts for clarity. Incidentally, this also fixes #231.