Merge branch 'release/v0.6.5' into 'master'

CMakeLists.txt

doc/doxygen.cmake

src/CMakeLists.txt

src/data/data_manager.cpp

src/data/data_manager.hpp

src/data/graph.hpp

src/data/nodes/bonus_points.cpp

src/data/nodes/bonus_points.hpp

src/data/nodes/dynexite_exam.cpp

src/data/nodes/grade_list.cpp

src/data/nodes/grade_list.hpp

src/data/nodes/student_data.cpp

src/data/nodes/user_grade_boundaries.cpp

src/data/nodes/user_grade_config.hpp

src/data/nodes/user_point_config.hpp

src/file_io/d2r_parser.cpp

src/file_io/d2r_parser.hpp

src/file_io/file.cpp

src/model/grade_model.cpp

src/model/grade_model.hpp