Merged requested to merge feature/DecoratorClipper into develop
Implements two new decorators :
- DecoratorVertexEdge: renders the vertices with spheres, and the edges with tubes, with configurable options.
- DecoratorClipper: using the vtk-connection framework, it clips out some vtkPolyData structure, with configurable options.
These new decorators are used in the branch feature/RefactoringClipper of coffee/precis.