ENH: minor improvements for Enum

- found() method for consistency with other classes

- operator()(name, deflt) for similarity to lookupOrDefault,
  but without a dictionary

applications/utilities/mesh/manipulation/stitchMesh/stitchMesh.C

@@ -309,7 +309,7 @@ int main(int argc, char *argv[])
                 if
                 (
                     matchName != "perfect"
-                 && !slidingInterface::typeOfMatchNames.hasEnum(matchName)
+                 && !slidingInterface::typeOfMatchNames.found(matchName)
                 )
                 {
                     Info<< "Error: unknown match type - " << matchName

applications/utilities/preProcessing/mapFieldsPar/mapFieldsPar.C

@@ -229,7 +229,7 @@ int main(int argc, char *argv[])
 
 
     word patchMapMethod;
-    if (meshToMesh::interpolationMethodNames_.hasEnum(mapMethod))
+    if (meshToMesh::interpolationMethodNames_.found(mapMethod))
     {
         // Lookup corresponding AMI method
         meshToMesh::interpolationMethod method =

applications/utilities/surface/surfaceBooleanFeatures/surfaceBooleanFeatures.C

@@ -1577,7 +1577,7 @@ int main(int argc, char *argv[])
         { booleanSurface::DIFFERENCE, "difference" }
     };
 
-    if (!validActions.hasEnum(action))
+    if (!validActions.found(action))
     {
         FatalErrorInFunction
             << "Unsupported action " << action << endl