Summary: Include <map> in Public Interface

Needed to honour requirements of class Summary in isolation.  While
here, also move <unordered_map> to implementation file.

opm/output/eclipse/Summary.hpp

@@ -20,16 +20,17 @@
 #ifndef OPM_OUTPUT_SUMMARY_HPP
 #define OPM_OUTPUT_SUMMARY_HPP
 
+#include <map>
 #include <string>
 #include <vector>
-#include <unordered_map>
 
 #include <ert/ecl/ecl_sum.h>
 
 #include <opm/parser/eclipse/EclipseState/Grid/EclipseGrid.hpp>
 
-#include <opm/output/eclipse/SummaryState.hpp>
 #include <opm/output/data/Wells.hpp>
+
+#include <opm/output/eclipse/SummaryState.hpp>
 #include <opm/output/eclipse/RegionCache.hpp>
 
 namespace Opm {

src/opm/output/eclipse/Summary.cpp

@@ -17,13 +17,14 @@
   along with OPM.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <algorithm>
 #include <exception>
 #include <initializer_list>
 #include <iterator>
 #include <numeric>
 #include <stdexcept>
 #include <string>
-#include <algorithm>
+#include <unordered_map>
 
 #include <opm/common/OpmLog/OpmLog.hpp>