* update the general TOC

* integrate the old geometry/sparse tutorial into the new one (they are better than nothing)
* remove the old tutorial on the core module

doc/I03_InsideEigenExample.dox

@@ -1,6 +1,6 @@
 namespace Eigen {
 
-/** \page InsideEigenExample Advanced - What happens inside Eigen, on a simple example
+/** \page TopicInsideEigenExample What happens inside Eigen, on a simple example
 
 \b Table \b of \b contents
   - \ref WhyInteresting