[Dune] [#951] Fix warning: unused parameter

[Dune]

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FS#951 - Fix warning: unused parameter
User who did this - Christian Engwer (christi)

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I agree with Markus, that we want to document the parameters. I see two possible ways:

1) use the void cast
  ... kind of ugly, but it works
  ... might be made a bit more readable with the "#define UNUSED_ARGUMENT(x) (void)x", as suggested on the webpage Markus mentioned.
2) use something like
  void foo(int UNUSED_ARG(bar))
  where UNUSED_ARG might be defined to different things, when compiling, or when using doxygen.
  For doxygen we would define something like "#define UNUSED_ARG(x) x",
  whereas the normal dune code would contain a definition like "#define UNUSED_ARGUMENT(x)" 
  or "#define UNUSED_ARG(x) UNUSED_ ## x __attribute__((unused))" if attribute unused is supported.
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