fem2d_mesh_display_opengl():
  C++ version
  This program reads information defining a mesh
  and displays an image of the mesh using OpenGL.

  The spatial dimension DIM_NUM =  2
  The number of nodes NODE_NUM =   38

  Minimum: 1  2
  Maximum: 4  6.67654
  Range:   3  4.67654

  The order ELEMENT_ORDER =            6
  The number of elements ELEMENT_NUM = 12

MESH_BASE_ZERO:
  The element indexing appears to be 1-based!
  This will be converted to 0-based.
  Pixels:  320  500