First version of simple viewer.
Update displayContours
Merge branch 'master' of github.com:DGtal-team/DGtalTools into SimpleVolViewer
Adding 3dVolBoundaryViewer, a simple viewer of a volume boundary.
Increase speed of 3dVolMarchingCubes by using predicate on image instead of DigitalSetBySTLSet (ie std::set).
Updating ChangeLog
Merge pull request #113 from JacquesOlivierLachaud/SimpleVolViewer

Faster vol viewer and marching cubes