Deprecate headers -- they are now in dune-gfe-coupling

[[Imported from SVN: r9467]]

dune/gfe/coupling/rodcontinuumcomplex.hh

 #ifndef ROD_CONTINUUM_COMPLEX_HH
 #define ROD_CONTINUUM_COMPLEX_HH
 
+#warning This file is deprecated.  Use the one in dune-gfe-coupling instead!
+
 #include <map>
 #include <string>
 

dune/gfe/coupling/rodcontinuumddstep.hh

 #ifndef ROD_CONTINUUM_DD_STEP_HH
 #define ROD_CONTINUUM_DD_STEP_HH
 
+#warning This file is deprecated.  Use the one in dune-gfe-coupling instead!
+
 /** \file
  *  \brief Base class for rod-continuum domain decomposition algorithms
  */

dune/gfe/coupling/rodcontinuumfixedpointstep.hh

 #ifndef ROD_CONTINUUM_FIXED_POINT_STEP_HH
 #define ROD_CONTINUUM_FIXED_POINT_STEP_HH
 
+#warning This file is deprecated.  Use the one in dune-gfe-coupling instead!
+
 /** \file
  * \brief Iteration step of a fixed-point method for rod-continua couplings
  */

dune/gfe/coupling/rodcontinuumsteklovpoincarestep.hh

 #ifndef ROD_CONTINUUM_STEKLOV_POINCARE_STEP_HH
 #define ROD_CONTINUUM_STEKLOV_POINCARE_STEP_HH
 
+#warning This file is deprecated.  Use the one in dune-gfe-coupling instead!
+
 #include <vector>
 
 #include <dune/common/shared_ptr.hh>