Bug 982310: projects are now shown in the Pydev Package Explorer when ad...

...ded to a selected Working Set.

If the Top Level Elements of the Pydev Package Explorer are Working Sets while at least one
working set is selected (either by means of the Select Working Set dialog or the Explorer's
drop-down menu), and a project is placed into a working set upon creation, it will now appear
in the Explorer without having to reselect anything to refresh it.