Informs about 2015 not installing C++ by default
(Installing Visual Studio caveats), gives more
detail on installing Pywin, and updates the
"Development in Visual Studio or other
IDEs" section.
Looks like I had kept my testing imports for the "advanced topics"
and forgot to replace them by the files from the newer snapshot.
We should now have 100% of the OP contents (+ what was added only
in this repo).