fixing bug in DCA drawing with the 'Annulus' mode
Merge pull request #800 from troussil/DCADisplay

fixing bug in DCA drawing with the 'Annulus' mode
Merge branch 'QuadNormal' of github.com:dcoeurjo/DGtal into TestQuadNormal
simplification in addQuad
Merge pull request #10 from kerautret/TestQuadNormal

Test quad normal