changed last argument of both CopyColumnFromMat functions and CopyVectorToColumn to const
changed last argument of both CopyColumnFromMat functions and CopyVectorToColumn to const

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