eUML : better syntax for front-ends defined with eUML as transititon table only. Caution: Breaking Change!

Bugfix: graph building was only working if initial_state defined as a sequence

Bugfix: flags defined for a Terminate or Interrupt state do not break the blocking function of these states any more.

Bugfix: multiple deferred events from several regions were not working in every case.

Bugfix: visitor was passed by value to submachines.

Bugfix: no_transition was not called for submachines who send an event to themselves.

Fixed warnings with gcc