Windows build scripts: detect case where user installed Visual Studio but not the C++ toolset. Also detect case where user's CMake version is too old for the desired generator.

README.md

@@ -8,14 +8,14 @@ Open source (LGPL) software library for working with the IFC file format.
 
 Prerequisites
 =============
-* Git, CMake (2.6 or newer), Visual Studio 2008 or newer (Windows), or GCC (*nix, Clang untested).
+* Git, CMake (2.6 or newer), Visual Studio 2008 or newer with C++ toolset (Windows), or GCC (*nix, Clang untested).
 
 
 Dependencies
 ============
 * [Boost](http://www.boost.org/)
 * Open Cascade *optional*, but required for building IfcGeom
-  [Official](http://www.opencascade.org/getocc/download/loadocc/) or [community edition](https://github.com/tpaviot/oce)  
+  ([official](http://www.opencascade.org/getocc/download/loadocc/) or [community edition](https://github.com/tpaviot/oce))  
   For converting IFC representation items into BRep solids and tesselated meshes
 * [ICU](http://site.icu-project.org/) *optional*  
   For handling code pages and Unicode in the parser
@@ -92,7 +92,10 @@ To build IfcOpenShell please take the following steps:
     $ cmake ../
     $ make
 
-If all worked out correctly you can now use IfcOpenShell. For example:
+If all worked out correctly you can now use IfcOpenShell. See the examples below.
+
+Usage examples
+==============
 
 **Invoking IfcConvert from the command line**
 
@@ -101,8 +104,6 @@ If all worked out correctly you can now use IfcOpenShell. For example:
     $ ./IfcConvert Munkerud_hus6_BE.ifc
     $ less Munkerud_hus6_BE.obj
 
-Or:
-
 **Using the IfcOpenShell Python interface**
 
     $ wget -O duplex.zip http://projects.buildingsmartalliance.org/files/?artifact_id=4278