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).

Test of metric as a shape measure. It uses the slot Rho instead of adding a new slot, define METRICSHAPEMEASURE in GmshDefines.h to activate !

(2) Make pyramid's points and monomials ready for differenciation of subdivision-ready and optimization-ready basis
(3) Correction number lagragian bezier coeff for pyramids p1

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Metric order is different from Jacobian order. Put Gradient matrices outside Jacobian in order to handle difference of order.