Add a validation code in MetricBasis to check that the process: "computation of Bézier coeff, subdivision and interpolation" is correct for Metric (thus also for Jacobian in 3D).

Mesh optimizer: changed input, improved robustness of barrier functions, added different scaling for node displacement, removed NCJ contribution, added IdealJac contribution.

Added access to Jacobian from ideal element in JacobianBasis. Added "idealJacobian" measure in MElement.

Adding GenericVertex, GenericEdge, GenericFace and GenericRegion: derived classes from GEntity (as OCCVertex, etc. for instance), providing a generic interface to any other modeler through the use of callbacks functions to be given by the user...

Added computation of normals and 3D primary Jacobian from ideal element in JacobianBasis. Worked on computation of inverse condition number. 

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