message: add boundary elements to the mesh
diff: MFEM mesh v1.0
  #
  -# MFEM Geometry Types (see mesh/geom.hpp):
  +# MFEM Geomety Types (see mesh/geom.hpp):
  #
  # POINT = 0
  # SEGMENT = 1
  @@ -22,10 +22,24 @@ elements
  1 7 11 7 1 5 8
  1 4 2 5 1 8
  -boundary
  -0
  +bounday
  +14
  +1 3 0 3 4 1
  +1 3 6 7 10 9
  +1 3 0 6 9 3
  +1 3 0 1 7 6
  +1 3 3 9 10 4
  +1 2 1 5 2
  +1 2 1 4 5
  +1 2 1 8 7
  +1 2 1 2 8
  +1 2 2 5 8
  +1 2 5 11 8
  +1 2 7 8 11
  +1 2 7 11 10
  +1 3 4 10 11 5
  -vertices
  +vetices
  12
  3
  0 0 0
  