Make SummaryState::set() available as __setitem__ in Python

opm/input/eclipse/Schedule/SummaryState.hpp

@@ -75,8 +75,10 @@ public:
     explicit SummaryState(std::time_t sim_start_arg);
 
     /*
-      The set() function has to be retained temporarily to support updating of
-      cumulatives from restart files.
+      The canonical way to update the SummaryState is through the update_xxx()
+      methods which will inspect the variable and either accumulate or just
+      assign, depending on whether it represents a total or not. The set()
+      method is low level and unconditionally do an assignment. 
     */
     void set(const std::string& key, double value);
 

python/cxx/summary_state.cpp

@@ -55,5 +55,6 @@ void python::common::export_SummaryState(py::module& module) {
         .def("__contains__", &SummaryState::has)
         .def("has_well_var", py::overload_cast<const std::string&, const std::string&>(&SummaryState::has_well_var, py::const_))
         .def("has_group_var", py::overload_cast<const std::string&, const std::string&>(&SummaryState::has_group_var, py::const_))
+        .def("__setitem__", &SummaryState::set)
         .def("__getitem__", py::overload_cast<const std::string&>(&SummaryState::get, py::const_));
 }