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-/*!
-
-\page quad_ijk_algo_page Quadrangle: Mapping meshing algorithm
-
-<b>Quadrangle: Mapping</b> meshing algorithm is intended for creating
-all-quadrangle and quad-dominant meshes on faces without holes and
-bound by at least three edges.
-
-The algorithm can create mesh on any face but its quality and
-validity depend on two factors:
-- face shape (number of edges and boundary concavity);
-- discretization of edges.
-
-\image html quad_mesh_invalid.png "Invalid mesh on quadrilateral concave faces"
-
-The algorithm uses <em>Transfinite Interpolation</em> technique in the 
-parametric space of a face to locate nodes inside the face.
-
-The algorithm treats any face as quadrangle. If a face is bound by
-more than four edges, four most sharp vertices are considered as
-corners of the quadrangle and all edges between these vertices are
-treated as quadrangle sides. In the case of three edges, the vertex
-specified by the user is considered as a fourth degenerated side of the
-quadrangle.
-
-\image html quad_meshes.png "Algorithm generates a structured mesh on complex faces provided that edges are properly discretized"
-
-To get an all-quadrangle mesh you have to carefully define 1D
-hypotheses on edges of a face. To get a \b structured mesh you have to provide
-equal number of segments on opposite sides of the quadrangle. If this
-condition is not respected, the algorithm by default (without a 
-hypothesis) creates a \b quad-dominant mesh with triangles located near the
-side with the maximal number of segments. However, you can get an
-\b all-quadrangle mesh in this case by using 
-\ref hypo_quad_params_anchor "Quadrangle Parameters"
-hypothesis to specify how to make transition mesh between opposite
-sides with different number of segments, provided that certain
-conditions are respected. In any case the total number of segments must be
-even. To use \a Reduced transition method, there must be an equal number
-of segments on one pair of opposite sides.
-
-The following hypotheses help to create quadrangle meshes. 
-- \ref propagation_anchor "Propagation" additional 1D hypotheses
-  help to get an equal number of segments on the opposite sides of a
-  quadrilateral face.
-- \ref a1d_algos_anchor "Composite Side Discretization" algorithm is useful
-  to discretize several C1 continuous edges as one quadrangle side.
-
-*/