Variance weights for libsgm

components/operators/include/ftl/operators/disparity.hpp

components/operators/src/disparity/fixstars_sgm.cpp

lib/libsgm/include/libsgm.h

lib/libsgm/src/horizontal_path_aggregation.cu

lib/libsgm/src/horizontal_path_aggregation.hpp

lib/libsgm/src/oblique_path_aggregation.cu

lib/libsgm/src/oblique_path_aggregation.hpp

lib/libsgm/src/path_aggregation.cu

lib/libsgm/src/path_aggregation.hpp

lib/libsgm/src/path_aggregation_common.hpp

lib/libsgm/src/sgm.cu

lib/libsgm/src/sgm.hpp

lib/libsgm/src/stereo_sgm.cpp

lib/libsgm/src/vertical_path_aggregation.cu

lib/libsgm/src/vertical_path_aggregation.hpp