Added "normalized corner Jacobian" quality measure for triangles and quads (not yet used nor tested)

Changed criterion for stagnation and fixed optimization w.r.t. CAD distacne in general mesh optimizer

cross-compiling) + dg : add numpy to cross-compilation instructions

static cast to a polynomial basis is used -> specialized for pyramids

The parser wanted to create extruded volume begining systematically from 1. 
Thus, when there already existed volumes with number 1,2,3,etc, extruded volumes was created.

petsc matrices

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disable option for 2 Pview (making difference between curved and straight-sided elements for non-simplex elements is more complex and makes less sens).
add possibility to compute 2D and 3D elments in one run.
add possibility to show PView for J and R in one run.