New USE version 3.0.2!

* [ASSL] Fixed bug in barrier statement

* [ASSL] Automatic calculation of barriers. Can be suppressed by using
the option -nb (no barriers) for gen start

* [ASSL] New Try-statement Try(Collection(Class), AttributeName, Sequence(Value)).

* [GUI] USE now saves a "default" Layout for the class diagram for a model.

* [GUI] Fixed object properties view to allow to set more then one attribute
at once.

* [GUI] Visible classes and associations can be exported as a new model.