Time::timeName(): no longer needed, calls replaced by name()

The timeName() function simply returns the dimensionedScalar::name() which holds
the user-time name of the current time and now that timeName() is no longer
virtual the dimensionedScalar::name() can be called directly.  The timeName()
function implementation is maintained for backward-compatibility.

applications/utilities/mesh/manipulation/mirrorMesh/mirrorMesh.C

@@ -78,7 +78,7 @@ int main(int argc, char *argv[])
     if (!overwrite)
     {
         runTime++;
-        mesh.setInstance(runTime.timeName());
+        mesh.setInstance(runTime.name());
     }