Preparing Methods for tests

src/methods/dbscan/dbscan.pl

src/methods/decision_tree/decision_tree.pl

src/methods/hoeffding_tree/hoeffding_tree.cpp

src/methods/hoeffding_tree/hoeffding_tree.pl

src/methods/hoeffding_tree/hoeffding_tree_test.pl

src/methods/kde/kde.cpp

src/methods/kde/kde.pl

src/methods/kde/kde_test.pl

src/methods/kernel_pca/kernel_pca.cpp

src/methods/kernel_pca/kernel_pca.pl

src/methods/kernel_pca/kernel_pca_test.pl

src/methods/kfn/kfn.cpp

src/methods/kfn/kfn.pl

src/methods/kfn/kfn_test.pl

src/methods/kmeans/kmeans_test.pl

src/methods/knn/knn.cpp

src/methods/knn/knn.pl

src/methods/knn/knn_test.pl

src/methods/lars/lars.cpp

src/methods/lars/lars.pl