Documentation, /docs/building/Win32.txt

Hi, I read the documentation in docs/buiding/win32.txt and it didn't really help. Brian gave me detailed instructions via email, I have modified them slightly with a few extra steps that I found were needed. These new instructions don't describe building by cygwin, but cygwin is pretty awful so I'd say thats a good thing. They do include MSYS instruction which is far better, and results in a perfectly working binary. They also describe building using Visual Studio, not from the command line but from the project files. Thanks Neil