Fix command line help display.
Fix command line help display.

poparteu/openMVG,poparteu/openMVG,poparteu/openMVG,poparteu/openMVG,openMVG/openMVG,openMVG/openMVG,openMVG/openMVG,openMVG/openMVG,openMVG/openMVG