+ add jacobianOrder(..)

+ add sampling points of pyramid jacobian 

make bezierBasis independant from declaration of element tag in GmshDefines.
move static methods getTag(..) & **FromTag(..) from MElement to ElementType.
completely revert to double for monomials.

Monomials order changed !
Points of Prism p>2 changed !
3D Serendipity elements have now nodes only on edges !

Modify gmshGeneratePoints.
All validated.

Warning : Points for high order prisms will change ! Old version is incoherent with what is done with other elements 

Goal: at the end, have only one algo for generation of Points/Monomials/Exponents/.. per element

spallart almaras is kinda working

dg: stereographic 3d operators. Diffusion stereo. Artificial diffusion stabilization. FunctionIntegrator: removed unneded printf

as a library)

Add a default implementation of fullMatrix<double>::invert and
fullMatrix<double>::determinant whn Lapack is not available. The algorirthms are bad but they allow to use polynomialBasis without installing BLAS and Lapack. The inverse is not computed a lot a time and the matrix is often not big in this case so there is no need of better algorithms

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live with rotations. Two examples were added
in the benchmarks/3d repository