Clean up. Comments, Remove old code. Change commands name
	modified:   libmscore/ambitus.cpp
	modified:   libmscore/barline.cpp
	modified:   libmscore/breath.cpp
	modified:   libmscore/chord.cpp
	modified:   libmscore/chordrest.cpp
	modified:   libmscore/clef.cpp
	modified:   libmscore/element.cpp
	modified:   libmscore/element.h
	modified:   libmscore/jump.cpp
	modified:   libmscore/keysig.cpp
	modified:   libmscore/marker.cpp
	modified:   libmscore/navigate.cpp
	modified:   libmscore/note.cpp
        modified:   libmscore/score.h
	modified:   libmscore/segment.cpp
	modified:   libmscore/segment.h
	modified:   libmscore/spanner.cpp
	modified:   libmscore/system.cpp
	modified:   libmscore/timesig.cpp
	modified:   mscore/actions.cpp
	modified:   mscore/scoreview.cpp