Add support for reading ascii Pro-E tetrahedral meshes

[kennyweiss]

A user requested the ability to read in Pro-E tet meshes for our shaping capability.

The ascii format for this is supposed to be:

<Number of Nodes> <Number of Tets>
<Node ID> <xcoord> <ycoord> <zcoord>
…
<Tetrahedron ID> <Node 1> <Node 2> <Node 3> <Node 4>
…

For MPI-based runs, we should read the file in on a single rank and then broadcast the data to the other ranks, as we do for STL and C2C meshes.