[cleanup] Remove svn substitution keyword

dune/common/exceptions.hh

 // -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 // vi: set et ts=4 sw=2 sts=2:
-// $Id$
 
 #ifndef DUNE_EXCEPTIONS_HH
 #define DUNE_EXCEPTIONS_HH