work on compounds (add fillelemes in spectralmap) and centerline

Geo/GFace.cpp

Geo/GFaceCompound.cpp

Mesh/BackgroundMesh.cpp

Mesh/CenterlineField.cpp

Mesh/Generator.cpp

Mesh/meshGEdge.cpp

Mesh/meshGFace.cpp

Mesh/meshGFaceBDS.cpp

benchmarks/centerlines/aorta_centerlines.geo

benchmarks/centerlines/myPARTS.msh

...arks/curvature/Bifurcation/BifurcationRemeshCurvature.geo