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Added temporary hack to force the Newton-Raphson algorithm used in GFace::XYZtoUV to enforce convergence in XYZ coordinates. Math should be checked for ruled surfaces obtained by extrusion, as some more fundamental problem seems to exists for points on the boundary of the CAD patches

Free Space test cases + Nodal Interpolation + Small Fix in FunctionSpace: Bug with cell function in 2D for 3D Function Space + Vertices of GroupOfElement

tolerance cannot be choosen that large; in case of non-connected meshes we could end up interpolating too far outside the (wrong) element, leading to bad values

DDM Tests: Rewritting SystemAbstract::getSolution + FunctionSpace::getUnorderedKeys() + FunctionSpace::getAllDofs with set + FunctionSpace::getKeys(set)

useful for remapping a mesh onto a (slightly modified) CAD, for sensitivity analyses