Resolves #329 optical flow

components/codecs/include/ftl/codecs/channels.hpp

components/operators/CMakeLists.txt

components/operators/include/ftl/cuda/fixed.hpp

...onents/operators/include/ftl/operators/cuda/disparity.hpp

components/operators/include/ftl/operators/opticalflow.hpp

components/operators/src/colours.cpp

components/operators/src/depth.cpp

components/operators/src/disparity/disp2depth.cu

components/operators/src/disparity/fixstars_sgm.cpp

components/operators/src/disparity/optflow_smoothing.cu

components/operators/src/nvopticalflow.cpp

components/operators/src/opticalflow.cu

components/operators/src/opticalflow_cuda.hpp

...ents/rgbd-sources/src/sources/stereovideo/stereovideo.cpp

lib/libsgm/src/horizontal_path_aggregation.cu