functions for indicating injection and production upating.

it is for WellCollection, which is logically wrong. It should be done in
the group level, while things will be different for multi-level groups.

The current implementation basically works for current needs, that we
only have one group.

opm/core/wells/WellCollection.hpp

@@ -117,6 +117,9 @@ namespace Opm
         /// strategy might be required.
         bool needUpdateWellTargets() const;
 
+        bool needUpdateInjectionTargets() const;
+        bool needUpdateProductionTargets() const;
+
         const size_t numNode() const;
 
         WellNode* getNode(size_t i) const;