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Deprecate the identitymatrix.hh file

Oliver Sander requested to merge feature/deprecate-identitymatrix into master

This patch makes the preprocessor emit a #warning whenever the file identitymatrix.hh is included.

Reasons:

  • It is not used anywhere in Dune core or staging or any other module I know.
  • I have never heard a compelling reason to have it.
  • It produces maintenance costs (see !52 (merged))
  • IIRC it entered dune-common without discussion.

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