Fix some typo error and make the subgraph edge sorting simpler.
Fix some typo error and make the subgraph edge sorting simpler.

caymard/openMVG,Vinzza/openMVG,yoshidaken/openMVG,yoshidaken/openMVG,mojovski/openMVG,openMVG/openMVG,openMVG/openMVG,Smozeley/openMVG,danylaksono/openMVG,caymard/openMVG,mojovski/openMVG,danylaksono/openMVG,danylaksono/openMVG,Vinzza/openMVG,Vinzza/openMVG,openMVG/openMVG,Smozeley/openMVG,poparteu/openMVG,openMVG/openMVG,poparteu/openMVG,poparteu/openMVG,mojovski/openMVG,openMVG/openMVG,poparteu/openMVG,yoshidaken/openMVG,Smozeley/openMVG,caymard/openMVG