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.
This reduces duplication and inconsistency between the List, Field, Map,
and PtrList variants. It also allows for future extension to other
container types such as DynamicList.
