Automatically select config box upon change

Automatically select either controller or key group box in
MidiControlListener new action dialog if the user changes something
inside the group.

Signed-off-by: Tobias Doerffel <tobias.doerffel@gmail.com>

include/piano.h

@@ -104,6 +104,10 @@ private:
 private slots:
 	void pianoScrolled( int _new_pos );
 
+signals:
+	void keyPressed( int );
+	void baseNoteChanged( void );
+
 } ;