[CMake] Wiki: version compatibility matrix

[Johannes Zarl]

Hello,

The compatibility matrix for different versions of cmake is now complete and 
awaits review: http://www.cmake.org/Wiki/CMake_Version_Compatibility_Matrix

Apart from factual errors and things I might have missed, I am also interested 
if someone has a better idea for embedding the comments: they make the tables 
broader than they need to be. Also, the wiki warns that the page might be to 
big for some browsers. Should the page be divided into subpages?

If no one objects, I will add a link to the main-page under "Development 
Topics" by Wednesday next week (2010-12-08).

Cheers,
  Johannes