[Gmsh] nodes are generated but not used in the tetra mesh

[Umut Tabak]

Dear developers,

A colleague, Alexander from Delft University of Technology, in the CC 
list of the mail, came up with sth strange for tetra mesh generation for 
a cylindrical geometry. In the attach, you can find the geometry and we 
can mesh the structure using

gmsh cylinder.geo -3

But there is a problem in the generated mesh structure, nodes 1 and 7 
are not used in the element connectivities, where the allocation of the 
system matrices are done with reference to node count and the number of 
degrees of freedom. This results in a gap in the element matrices where 
problems start to pop up in the eigenvalue computations. The geometry is 
attached.

We would appreciate comments on this topic.

Best,
Umut
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