dg : do not initialize dofContainer to 0 by default
dg : all testcases ported to python3
gmsh : use dcopy/zcopy in fullMatrix::setAll
gmsh : add a flag to prevent initialization of fullMatrix

boundary layers in 3D are advancing (filtering intersecting layers using rtrees)
randomness of 2D meshes is now close to be ok (we still have problems with OCC ...)

fullMatrix::gemm

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+ 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.