ENH: allow wordHashSet filter for IOobjectList::names

- simplifies usage.
  Support syncPar check on names() to detect inconsistencies.

- simplify readFields, ReadFields and other routines by using these
  new methods.

applications/utilities/preProcessing/mapFields/MapConsistentVolFields.H

@@ -51,7 +51,7 @@ void MapConsistentVolFields
 
     IOobjectList fields = objects.lookupClass(fieldType::typeName);
 
-    forAllIter(IOobjectList, fields, fieldIter)
+    forAllConstIters(fields, fieldIter)
     {
         Info<< "    interpolating " << fieldIter()->name()
             << endl;

applications/utilities/preProcessing/mapFields/MapLagrangianFields.H

@@ -60,7 +60,7 @@ void MapLagrangianFields
     {
         IOobjectList fields = objects.lookupClass(IOField<Type>::typeName);
 
-        forAllIter(IOobjectList, fields, fieldIter)
+        forAllConstIters(fields, fieldIter)
         {
             Info<< "    mapping lagrangian field "
                 << fieldIter()->name() << endl;
@@ -98,7 +98,7 @@ void MapLagrangianFields
         IOobjectList fieldFields =
             objects.lookupClass(IOField<Field<Type>>::typeName);
 
-        forAllIter(IOobjectList, fieldFields, fieldIter)
+        forAllConstIters(fieldFields, fieldIter)
         {
             Info<< "    mapping lagrangian fieldField "
                 << fieldIter()->name() << endl;
@@ -137,7 +137,7 @@ void MapLagrangianFields
         IOobjectList fieldFields =
             objects.lookupClass(CompactIOField<Field<Type>, Type>::typeName);
 
-        forAllIter(IOobjectList, fieldFields, fieldIter)
+        forAllConstIters(fieldFields, fieldIter)
         {
             Info<< "    mapping lagrangian fieldField "
                 << fieldIter()->name() << endl;

applications/utilities/preProcessing/mapFields/MapVolFields.H

@@ -51,7 +51,7 @@ void MapVolFields
 
     IOobjectList fields = objects.lookupClass(fieldType::typeName);
 
-    forAllIter(IOobjectList, fields, fieldIter)
+    forAllConstIters(fields, fieldIter)
     {
         IOobject fieldTargetIOobject
         (

applications/utilities/preProcessing/mapFields/UnMapped.H

@@ -39,7 +39,7 @@ void UnMapped(const IOobjectList& objects)
 {
     IOobjectList fields = objects.lookupClass(Type::typeName);
 
-    forAllConstIter(IOobjectList, fields, fieldIter)
+    forAllConstIters(fields, fieldIter)
     {
         mvBak(fieldIter()->objectPath(), "unmapped");
     }