Hi again,

I'm trying to use libmesh to replace some legacy custom FEM software.  I
need an output file where every line of text contains the value of a
solution variable at the corresponding node in a VTK input mesh.  For
example, the value of the solution at node 5 in the VTK file should be
at line 5 in the output file. 

This seems trivial, but I can't figure out how to do this in parallel.  
MeshData doesn't work in parallel, and partitioning can introduce
arbitrary reorderings of the Node ids.  I can't figure out how to invert
the partitioning so I can get the correct ordering for output. 

I looked a bit into the Xdr class, and it uses a space-filling curve to
construct a canonical ordering.  This isn't what I want-- I need the
output node ordering to match my input mesh exactly so I can
post-process the results with downstream software.

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