Put graph and topology concepts in namespace DGtal::concepts
Add functors to VCM kernel functions and create files accordingly.
Fixing href links for concepts docs.
Fixing href links for concepts in graph and topology docs.
Fixing links in documentation module Digital Surface.
Update comments. Put SCellFunctors into namespace DGtal::functors.
Fix doc in SCellsFunctors for markdown.
Update namespace for concepts related to plane recognition.
Merge branch 'master' of github.com:DGtal-team/DGtal into FixGraphNamespaces
Update namespace concepts for surface estimators. Fix docs accordingly.
Update ChangeLog
Removing VCMGeometricFunctors namespace and IIGeometricFunctors namespace (now functors are all in namespace functors::).
Fix doc of module VCM and module II accordingly.
Merge pull request #912 from JacquesOlivierLachaud/FixGraphNamespaces

Fix graph and topology namespaces