[Dune] gmsh-documentation

[Oliver Sander]

Hi Dan!
Thanks for writing documentation about the gmsh import.  However,
I am not really convinced that you put them in the proper place.
The external_libraries directory has so far been only for installation
instructions, and not more.  I think we should keep it that way and
put usage instructions elsewhere.  Could you maybe merge your
usage instructions into the grid-howto?  Thank you!

I gather from your notes that the problem with orientation inconsistencies
can at least be circumvented somehow within gmsh.  Can you give
me an update on the situation, please?

best wishes,
Oliver

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* Oliver Sander                ** email: sander at mi.fu-berlin.de        *
* Freie Universität Berlin     ** phone: + 49 (30) 838 75348           *
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