[Python-Dev] [Python-checkins] devguide: Add VS2010 link and text, then restructure a few things

["Martin v. Löwis"]

> +All versions previous to 3.3 use Microsoft Visual Studio 2008, available at
> +https://www.microsoft.com/visualstudio/en-us/products/2008-editions/express.

This isn't actually the case. 2.4 and 2.5 used Visual Studio 2003, 2.0 
to 2.3 used VC6, 1.4 and 1.5 used Visual C++ 1.5; versions before that
were available only from Mark Hammond.

Regards,
Martin