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major commit : frontal 2D algo now should be way better and work on any kind of surface, even with a super bad parametrization

Centerline with close and create volume works fine, next step is to add some boundary layers in the volume

Associate mesh vertices primarily with GEntities that represent chains. Otherwise two overlapping n-dim GEntities with common mesh vertex (and no n-1-dim GEntity at the vertex) will have some vertex ownership issues. This prevents crashes when remeshing after homology computation.

This reverts commit 7c5e27d86cab09231e1c90c6a7b19bd3db9689b1.

You can use this as follows:
Mesh.RemeshParametrization=3; //(0=harmonic, 1=conformal, 2=rbf harmonic, 3=harmonicplane, 4=convex)

fixed nasty bug in quad meshing
added parameters to BL generation (2D)

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Corrected a bug where multiple copies of elements were created and removed duplicate vertices at block boundaries.