Use new mvBak() in a few places to avoid hammering existing files

applications/utilities/preProcessing/mapFields/UnMapped.H

@@ -47,7 +47,7 @@ void UnMapped(const IOobjectList& objects)
         ++fieldIter
     )
     {
-        mv(fieldIter()->objectPath(), fieldIter()->objectPath() + ".unmapped");
+        mvBak(fieldIter()->objectPath(), "unmapped");
     }
 }
 

src/turbulenceModels/compressible/RAS/backwardsCompatibility/wallFunctions/backwardsCompatibilityWallFunctionsTemplates.C

@@ -104,7 +104,7 @@ autoCreateWallFunctionField
         // rename file
         Info<< "    Backup original " << fieldName << " to "
             << fieldName << ".old" << endl;
-        mv(ioObj.objectPath(), ioObj.objectPath() + ".old");
+        mvBak(ioObj.objectPath(), "old");
 
 
         PtrList<fvPatchField<Type> > newPatchFields(mesh.boundary().size());

src/turbulenceModels/incompressible/RAS/backwardsCompatibility/wallFunctions/backwardsCompatibilityWallFunctionsTemplates.C

@@ -104,7 +104,7 @@ autoCreateWallFunctionField
         // rename file
         Info<< "    Backup original " << fieldName << " to "
             << fieldName << ".old" << endl;
-        mv(ioObj.objectPath(), ioObj.objectPath() + ".old");
+        mvBak(ioObj.objectPath(), "old");
 
 
         PtrList<fvPatchField<Type> > newPatchFields(mesh.boundary().size());