Rich: do not specify unnecessary Gaudi::Range_ arguments

Prepare for a future change in Gaudi -- simplify the (very long) typename for Gaudi::NamedRange_ (which increases the memory consumption during compilation) by dropping the (optional) 'Iteratorargument fromGaudi::NamedRangeas it _always_ at its default value -- do not specify an explicitIterator` when declaring a range, but instead rely on the default value (which implies that in the future, the argument can be dropped without changes here).

(the description here is considerably longer than the actual trivial change)