Added debug events, debug mode detection and fixed compiling error. * main-window: Added new slots reacting on debug mode changes. * octave-event-listener: Extended interface to transmit debug mode changes. * octave-event: Added a lot of debug events. * octave-link: Added code to detect the change of the debug mode flag. * octave-qt-event-listener: Implemented new interface methods. * workspace-view.h: Added missing #include.

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