Fix DefaultListenableList.subList and implement listIterator

[GoogleCodeExporter]

DefaultListenableList.subList returns a listenable list that does not know
about the offset index (hence the CollectionEvent.getFirst/LastIndex() will
return invalid values).
listIterator can be implemented on the model of what was done in AdaptedList.

Original issue reported on code.google.com by olivier.chafik@gmail.com on 21 Feb 2008 at 10:48