geometry. It introduces subtle bugs when reading high-order post-processing views.

IMHO we should have an explicit command to do this, and not modify the mesh without
warning just by reading a file

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use same tolerance in mesh extrusion as in geometry ; if this tol is too large, we should introduce another option

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).

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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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 !

Removed lots of warning introduced with my last commit, cleaned up a bit duplicateBoundaries, and introduced support for 2D for DuplicateBoundaries.

More cleanup is going to follow soon, especially in the modified part of commandline.

Addition of plugin DuplicateBoundary that allow one to modelize inter granular cracks with cohesive zones. 
Addition of the line command ComputeBestSeeds that allow one to optimize the placement of seeds in a microstructure to remove small edges from the Voronoï representation.
Small additions to cross3D and direction3D to compute the smoothness fo fields.