add mpi serialization for EclHysteresisConfig

opm/material/fluidmatrixinteractions/EclHysteresisConfig.hpp

@@ -172,6 +172,32 @@ public:
     }
 #endif
 
+    template<class Serializer>
+    std::size_t packSize(Serializer& serializer) const
+    {
+        return serializer.packSize(enableHysteresis_) +
+               serializer.packSize(pcHysteresisModel_) +
+               serializer.packSize(krHysteresisModel_);
+    }
+
+    template<class Serializer>
+    void pack(std::vector<char>& buffer, int& position,
+              Serializer& serializer) const
+    {
+        serializer.pack(enableHysteresis_, buffer, position);
+        serializer.pack(pcHysteresisModel_, buffer, position);
+        serializer.pack(krHysteresisModel_, buffer, position);
+    }
+
+    template<class Serializer>
+    void unpack(std::vector<char>& buffer, int& position,
+                Serializer& serializer)
+    {
+        serializer.unpack(enableHysteresis_, buffer, position);
+        serializer.unpack(pcHysteresisModel_, buffer, position);
+        serializer.unpack(krHysteresisModel_, buffer, position);
+    }
+
 private:
     // enable hysteresis at all
     bool enableHysteresis_;