Merge branch 'classification_error' into 'master'

src/classification/ConvexHull1D.cpp

src/classification/ConvexHull1D.hpp

src/classification/SVMWrapper.cpp

src/classification/utils.cpp

src/descriptor_identifier/SISSO_DI/SISSOClassifier.cpp

src/feature_creation/feature_space/FeatureSpace.cpp

src/feature_creation/feature_space/FeatureSpace.hpp

src/python/feature_creation/FeatureSpace.cpp

src/utils/compare_features.cpp

src/utils/compare_features.hpp

src/utils/math_funcs.cpp

src/utils/math_funcs.hpp

src/utils/project.cpp

src/utils/project.hpp

tests/exec_test/classification/data.csv

...r_identification/sisso_regressor/test_sisso_classifier.cc

tests/googletest/utils/test_compare_features.cc