COMP: provide NamedEnum::found() method for third-party code

- eg, swak4Foam uses it for NumericAccumulationNamedEnum

src/OpenFOAM/primitives/enums/NamedEnum.H

@@ -117,6 +117,9 @@ public:
 
       // Query
 
+        //- Test if there is an enumeration corresponding to the given name.
+        inline bool found(const word& enumName) const;
+
         //- Test if there is an enumeration corresponding to the given name.
         inline bool hasEnum(const word& enumName) const;
 

src/OpenFOAM/primitives/enums/NamedEnumI.H

@@ -46,6 +46,16 @@ inline Foam::wordList Foam::NamedEnum<EnumType, nEnum>::sortedToc() const
 }
 
 
+template<class EnumType, int nEnum>
+inline bool Foam::NamedEnum<EnumType, nEnum>::found
+(
+    const word& enumName
+) const
+{
+    return lookup_.found(enumName);
+}
+
+
 template<class EnumType, int nEnum>
 inline bool Foam::NamedEnum<EnumType, nEnum>::hasEnum
 (