[release,amg] Corrected log which coarse direct solver is used in the AMG

After adding UMFPack support, the printed log message was "Using DIRECTSOLVER"
which irritated users. With this path the actual direct solver will be
printed.

dune/istl/paamg/amg.hh

@@ -506,8 +506,6 @@ namespace Dune
            || (matrices_->parallelInformation().coarsest().isRedistributed()
                && matrices_->parallelInformation().coarsest().getRedistributed().communicator().size()==1
                && matrices_->parallelInformation().coarsest().getRedistributed().communicator().size()>0)) { // redistribute and 1 proc
-          if(verbosity_>0 && matrices_->parallelInformation().coarsest()->communicator().rank()==0)
-            std::cout<<"Using DIRECTSOLVER"<<std::endl;
           if(matrices_->parallelInformation().coarsest().isRedistributed())
           {
             if(matrices_->matrices().coarsest().getRedistributed().getmat().N()>0)
@@ -517,6 +515,8 @@ namespace Dune
               solver_.reset();
           }else
             solver_.reset(new DIRECTSOLVER<typename M::matrix_type>(matrices_->matrices().coarsest()->getmat(), false, false));
+          if(verbosity_>0 && matrices_->parallelInformation().coarsest()->communicator().rank()==0)
+            std::cout<< "Using a direct coarse solver (" << static_cast< DIRECTSOLVER<typename M::matrix_type>* >(solver_.get())->name() << ")" << std::endl;
         }else
 #undef DIRECTSOLVER
 #endif

dune/istl/superlu.hh

@@ -362,6 +362,8 @@ namespace Dune
      * @warning later calling apply will result in an error.
      */
     void free();
+
+    const char* name() { return "SuperLU"; }
   private:
     friend class std::mem_fun_ref_t<void,SuperLU>;
     template<class M,class X, class TM, class TD, class T1>

dune/istl/umfpack.hh

@@ -407,6 +407,8 @@ namespace Dune {
       mat_is_loaded = false;
     }
 
+    const char* name() { return "UMFPACK"; }
+
     private:
     typedef typename Dune::UMFPackMethodChooser<T> Caller;