Merge branch 'feature/ceres' into 'master'

CMakeLists.txt

applications/calibration-ceres/CMakeLists.txt

applications/calibration-ceres/src/calibration.cpp

applications/calibration-ceres/src/calibration.hpp

applications/calibration-ceres/src/calibration_data.cpp

applications/calibration-ceres/src/calibration_data.hpp

applications/calibration-ceres/src/main.cpp

applications/calibration-ceres/src/optimization.cpp

applications/calibration-ceres/src/optimization.hpp

applications/calibration-ceres/src/visibility.cpp

applications/calibration-ceres/src/visibility.hpp

applications/calibration-ceres/test/CMakeLists.txt

applications/calibration-ceres/test/calibration_unit.cpp

applications/calibration-ceres/test/catch.hpp

applications/calibration-ceres/test/tests.cpp

applications/calibration-ceres/test/visibility_unit.cpp

applications/calibration-multi/CMakeLists.txt

applications/calibration-multi/src/main.cpp

applications/calibration-multi/src/multicalibrate.cpp

applications/calibration-multi/src/multicalibrate.hpp