remove deprecated centerline test-cases

benchmarks/centerlines/aneu_int.stl

benchmarks/centerlines/aneurysm_centerlines.geo

benchmarks/centerlines/aorta.stl

benchmarks/centerlines/aorta2.stl

benchmarks/centerlines/aorta_centerlines.geo

benchmarks/centerlines/bypass.stl

benchmarks/centerlines/bypass_centerlines.geo

benchmarks/centerlines/carotid.stl

benchmarks/centerlines/carotid_centerlines.geo

benchmarks/centerlines/centerlinesANEU.vtk

benchmarks/centerlines/centerlinesAORTA.vtk

benchmarks/centerlines/centerlinesBYPASS.msh

benchmarks/centerlines/centerlinesCAROTID.vtk

benchmarks/centerlines/centerlinesCEREBRAL.vtk

benchmarks/centerlines/centerlinesLUNG.vtk

benchmarks/centerlines/centerlinesPATIENT.vtk

benchmarks/centerlines/cerebral.stl

benchmarks/centerlines/cerebral_centerlines.geo

benchmarks/centerlines/cyl_centerlines.geo

benchmarks/centerlines/cylemi.stl