* minor dox tweaks
* pretext to bump to beta6

CMakeLists.txt

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 41d30c1..dd74b76 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,5 +1,5 @@
 project(Eigen)
-set(EIGEN_VERSION_NUMBER "2.0-beta5")
+set(EIGEN_VERSION_NUMBER "2.0-beta6")
 
 #if the svnversion program is absent, this will leave the SVN_REVISION string empty,
 #but won't stop CMake.