Improvement at AssociationWidget static method findInterceptOnEdge :

umbrello/umlwidgets/associationwidget.{h,cpp}
- At function findInterceptOnEdge,
  - change return type to bool where true indicates success and false
    indicates error;
  - add reference argument qreal &result returning what was formerly the
    function return value.

umbrello/umlwidgets/associationwidget.cpp
- In function updateAssociations foreach-loop over list,
  - add debug message showing all relevant data before call to
    findInterceptOnEdge();
  - adjust call of findInterceptOnEdge() to the changed signature.
- In function updateRegionLineCount calculation of QPointF pt add debug
  message showing the relevant data.