GraphViewer: added Show/Hide global path
GraphViewer: added Show/Hide global path

MASKOR/rtabmap,chen0510566/rtabmap,srmanikandasriram/rtabmap,markusgrotz/rtabmap,srmanikandasriram/rtabmap,markusgrotz/rtabmap,MASKOR/rtabmap,chen0510566/rtabmap,srmanikandasriram/rtabmap,chen0510566/rtabmap,MASKOR/rtabmap,markusgrotz/rtabmap