API review: RT-38292,[SortedList] should provide a sort() method

[Martin Sladecek]

Hello,
based on the request in the JIRA, I propose to add SortedList.sort() and 
FilteredList.filter() methods that
trigger the sorting or filtering operation in case the data on the last 
sort were outdated and it is not possible to use 
FXCollections.observableList(List, Callback) wrapper for some reason.

More details in the JIRA: https://javafx-jira.kenai.com/browse/RT-38292

Thanks,
-Martin