Issue 2599, 2940 - Fix the presence of correct ATL version

README.md

Index: README.md
===================================================================
--- a/README.md
+++ b/README.md
@@ -17,8 +17,19 @@
 --------
 
 You need Microsoft Visual C++ 2012 and Python 2.7. Make sure that `python.exe` 

[Eric, 2015/10/08 14:36:35]

This line of text has become confusing given the facts. First and easiest, split
out the Python requirements into their own paragraph.

Given how much of a mess it is to set up a proper development environment, it
behooves us to explain it in detail and with as little confusion as possible.
This means one paragraph on each of the following topics.
  -- which VC++ toolset we require
  -- which ATL versions will work
  -- which version of Visual Studio as an IDE will work
Please don't quibble about the need to be verbose here. Just because you already
understand it doesn't mean someone coming in cold will. The comment policy in
the code is "someone familiar with the code base". That policy can't work in
this case, because you can't be familiar with the code base before you can get
to compile, and you can't do that before you get a development environment up
and running.

Microsoft does not have a product named "Microsoft Visual C++ 2012". When you
search for that, all you get is the redistributable library packages. It is more
accurate to say that you need the "Visual C++ 2012 toolset". To my knowledge,
the only standard way to get this toolset installed is to install some version
of Visual Studio 2012. We know that any version of VS 2012 satisfies the toolset
requirement.

For ATL, we can list three sources we know work.
  -- (free) VS 2013 Community
  -- (paid) VS 2012 Professional and Ultimate
I presume that the ATL in paid versions of VS 2013 does work, but we shouldn't
list it until after we've tested it. We should also mention here that the ATL in
VS 2015 Community does _not_ work.

For Visual Studio as an IDE, it seems that any version 2012, 2013, 2015 works. I
have tested the following configuration.
  -- toolset from VS 2012 Express
  -- ATL from VS 2013 Community
  -- IDE from VS 2015 Community

-is on your `PATH`. Unfortunately until we move to Visual Studio 2013  you'll
-need to use Visual Studio 2012 version that comes with ATL (Proffessional etc). 
+is on your `PATH`. When building with Express edition you also need some
+Visual Studio which comes with ATL. For example, if you use Visual Studio 2013
+Community Edition then set `VCInstallDir_120` environment variable to the
+directory of Visual C++ (for example,
+`C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC`).
+
+Building is tested on the following configurations
+- [free for everybody] "Microsoft Visual Studio Express 2012 for Windows
+Desktop" with "Microsoft Visual Studio Community 2013" as the source of ATL.
+- "Microsoft Visual Studio Express 2012 for Windows Desktop" with "Microsoft
+Visual Studio Professional 2012" as the source of ATL.
+- "Microsoft Visual Studio Professional 2012"
+- "Microsoft Visual Studio Ultimate 2012"
 
 * Execute `createsolution.bat` to retrieve dependencies and generate project
 files, this will create `build\ia32\adblockplus.sln` (solution for the 32 bit