I just drop 0.3 to meet
- declaration -> *.hpp
- definitions  -> *.cpp 
Unfortunately, the tests are 
discouraging ! Too few features installed.
Is it possible to edit an UML Class?
yes, but it is the 
only feasible action !! you have to capture the elements of the class in a dialog.
Is it possible to save an UML Diagram?
no, we can not do anything.
Too much work to do, I do not have time.
It's a shame, the basic ideas are good.