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Fixed intersection of metrics. Improved intersection of mesh metrics deriving from characteristic lengths.

Completed modification of "eigendirections" metric types with correct curvature computation in 2D & 3D. Adapted meshMetric::exportInfo to 3D. 

the partition to 1.

In Blasius 2D , we control the number of elements.

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parametrization of surfaces with holes much better -> mean plane gmsh faces are created for holes and are remeshed with frontal algo

This reverts commit 55b9435a12d5cd16d51ce1f0426fb8fb643a41f6.

Adding technique 5 to meshMetric: linear interpolation of h in band around iso, instead of linear interpolation of the metric (1/h^2)

Add a new metric computation for level set, simply based on ls gradient and hessian eigendirections.
meshAdapt was modified to receive and intersect multiple metrics, preserving the most anisotropic metric.
Also added input and output functions to dgDofContainer, for the "NodeData" format.
Benchmark for anisotropic adaptation to level set iso-zero created in benchmarks_gmsh/LSIsozeroAniso.

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