Continued working on entity details view and improved the gui 

@Tobi: Changed JListsControl to generic type JListsControl<T> as well as
listEntities in Gui to JListsControl<EntityArticleWrapper>

Reason: Type safety (now we've been having generics for TEN years... or
who wants to program as in J2SE 1.4?)

btw.: i didn't change anything on the JList belonging to the articles