Fix ambiguous match: option -s matches --single and --scale.
Fix ambiguous match: option -s matches --single and --scale.

darcyliu/mlpack,bmswgnp/mlpack,lezorich/mlpack,minhpqn/mlpack,theranger/mlpack,trungda/mlpack,theranger/mlpack,datachand/mlpack,stereomatchingkiss/mlpack,thirdwing/mlpack,palashahuja/mlpack,ajjl/mlpack,ranjan1990/mlpack,ajjl/mlpack,minhpqn/mlpack,Azizou/mlpack,trungda/mlpack,thirdwing/mlpack,erubboli/mlpack,trungda/mlpack,darcyliu/mlpack,palashahuja/mlpack,ranjan1990/mlpack,ajjl/mlpack,BookChan/mlpack,datachand/mlpack,Azizou/mlpack,chenmoshushi/mlpack,darcyliu/mlpack,ersanliqiao/mlpack,lezorich/mlpack,bmswgnp/mlpack,palashahuja/mlpack,Azizou/mlpack,chenmoshushi/mlpack,erubboli/mlpack,stereomatchingkiss/mlpack,bmswgnp/mlpack,stereomatchingkiss/mlpack,ranjan1990/mlpack,erubboli/mlpack,lezorich/mlpack,ersanliqiao/mlpack,chenmoshushi/mlpack,theranger/mlpack,BookChan/mlpack,datachand/mlpack,minhpqn/mlpack,BookChan/mlpack,ersanliqiao/mlpack,thirdwing/mlpack