[amg] split hierarchy.hh

Hierarchy and MatrixHierarchy now have separate headers to improve
readability.

dune/istl/paamg/CMakeLists.txt

@@ -14,6 +14,7 @@ install(FILES
   graph.hh
   graphcreator.hh
   hierarchy.hh
+  matrixhierarchy.hh
   indicescoarsener.hh
   kamg.hh
   parameters.hh

dune/istl/paamg/amg.hh

@@ -7,7 +7,7 @@
 #include <dune/common/exceptions.hh>
 #include <dune/istl/paamg/smoother.hh>
 #include <dune/istl/paamg/transfer.hh>
-#include <dune/istl/paamg/hierarchy.hh>
+#include <dune/istl/paamg/matrixhierarchy.hh>
 #include <dune/istl/solvers.hh>
 #include <dune/istl/scalarproducts.hh>
 #include <dune/istl/superlu.hh>

dune/istl/paamg/fastamg.hh

@@ -9,7 +9,7 @@
 #include <dune/common/unused.hh>
 #include <dune/istl/paamg/smoother.hh>
 #include <dune/istl/paamg/transfer.hh>
-#include <dune/istl/paamg/hierarchy.hh>
+#include <dune/istl/paamg/matrixhierarchy.hh>
 #include <dune/istl/solvers.hh>
 #include <dune/istl/scalarproducts.hh>
 #include <dune/istl/superlu.hh>

dune/istl/paamg/test/hierarchytest.cc

@@ -4,7 +4,7 @@
 
 #include "mpi.h"
 #include <dune/common/parallel/mpicollectivecommunication.hh>
-#include <dune/istl/paamg/hierarchy.hh>
+#include <dune/istl/paamg/matrixhierarchy.hh>
 #include <dune/istl/paamg/smoother.hh>
 #include <dune/istl/preconditioners.hh>
 #include <dune/istl/owneroverlapcopy.hh>