Enhancing Statistic (types) and moving it to math
Fixes  #533
 a same name is given for the file, the file command and page command
link to packageGeometryConcepts.dox
Merge pull request #565 from troussil/docUpdate

Doc update
Merge pull request #557 from dcoeurjo/Stats

Enhancing Statistic (types) and moving it to math
Merge branch 'BoostGraph' of github.com:JacquesOlivierLachaud/DGtal into BoostGraph
Fix some errors in inclusion and doc.