Sigh++

Removed lots of warning introduced with my last commit, cleaned up a bit duplicateBoundaries, and introduced support for 2D for DuplicateBoundaries.

More cleanup is going to follow soon, especially in the modified part of commandline.

Addition of plugin DuplicateBoundary that allow one to modelize inter granular cracks with cohesive zones. 
Addition of the line command ComputeBestSeeds that allow one to optimize the placement of seeds in a microstructure to remove small edges from the Voronoï representation.
Small additions to cross3D and direction3D to compute the smoothness fo fields.

communication to the metamoodel of the Gmsh batch and loop status; OL preprocessors returns the /changed/ status of the client; /changed/ flag of all parameters set to false after a /compute/; param attributes updated (not replaced) by a parameter redefinition; + some clean up 

Store the directions in the GFaces of the model to avoid recomputing them after the 3D meshing. These changes should have no impact unless the option R-tree (experimental) is selected.

Fopen deals with non-ASCII filename paths on Windows.

used without the ANN.h file

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natural convection added in the incompressible code