[Gmsh] more tets than hexes in hex-dom mesh of cube

[Paul Garlick]

I attach another image showing the distribution of nodes within the 
cube, hexDomCube_2.png.  The green dots show the regular pattern of 
nodes on the near face, the reds dots show the interior nodes.

Comparing this image with Fig 13(b) from the AMSES paper

http://www.amses-journal.com/content/1/1/8

it is clear that the distribution of the interior nodes in the cube is 
considerably more irregular. Beyond the first layer the pattern looks 
more like a Delaunay mesh.  Does this indicate a problem with the vertex 
insertion part of the algorithm?  
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