HXT 3D mesher included in gmsh

Common/CommandLine.cpp

Common/GmshDefines.h

Mesh/CMakeLists.txt

Mesh/meshGFace.cpp

Mesh/meshGRegion.cpp

contrib/hxt/CMakeLists.txt

contrib/hxt/CREDITS.txt

contrib/hxt/LICENSE.txt

contrib/hxt/hxt_api.h

contrib/hxt/hxt_bbox.c

contrib/hxt/hxt_bbox.h

contrib/hxt/hxt_boundary_recovery.cxx

contrib/hxt/hxt_boundary_recovery.h

contrib/hxt/hxt_laplace.h

contrib/hxt/hxt_linear_system_lu.c

contrib/hxt/hxt_linear_system_petsc.c

contrib/hxt/hxt_mean_values.c

contrib/hxt/hxt_mesh.c

contrib/hxt/hxt_mesh.h

contrib/hxt/hxt_mesh3d.c