unify config.h includes

examples/heat.cc

-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include <config.h>
+
 #include <iostream>
 
 #include <amdis/AMDiS.hpp>

examples/neumann.cc

-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include <config.h>
+
 #include <iostream>
 
 #if HAVE_DUNE_SPGRID

examples/periodic.cc

-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include <config.h>
+
 #include <iostream>
 
 #if HAVE_DUNE_SPGRID

examples/surface.cc

-#include "config.h"
 #include <amdis/AMDiS.hpp>
 #include <amdis/Integrate.hpp>
 #include <amdis/LocalOperators.hpp>

examples/vecellipt.cc

-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
+#include <config.h>
 
 #include <iostream>
 

test/AdaptiveGridTest.cpp

-#include "config.h"
+#include <config.h>
+
 #include <dune/grid/yaspgrid.hh>
 #include <dune/grid/test/gridcheck.hh>
 

test/DOFVectorTest.cpp

-#include "config.h"
+#include <config.h>
 
 #include <memory>
 

test/DataTransferTest.hpp

-
-#ifdef HAVE_CONFIG_H
-# include "config.h"
-#endif
+#include <config.h>
 
 #include <array>
 #include <cmath>

test/ISTLCommTest.cpp

-#include "config.h"
+#include <config.h>
 
 #include <array>
 #include <bitset>

test/OperatorsTest.cpp

-// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
-// vi: set et ts=4 sw=2 sts=2:
-#include "config.h"
 #include <amdis/AMDiS.hpp>
 #include <amdis/ProblemStat.hpp>
 #include <amdis/LocalOperators.hpp>

test/TreeContainerTest.cpp

-#include "config.h"
+#include <config.h>
+
 #include <dune/grid/yaspgrid.hh>
 
 #include <dune/functions/functionspacebases/compositebasis.hh>