Merge branch 'master' of gitlab.mpcdf.mpg.de:tpurcell/cpp_sisso into joss

.gitlab-ci.yml

docs/development/Credits.md

docs/index.rst

docs/quick_start/QuickStart.rst

docs/quick_start/code_ref.md

docs/tutorial/0_intro.md

docs/tutorial/1_command_line.md

docs/tutorial/3_classification.md

docs/tutorial/command_line/cv/3d_model.png

docs/tutorial/command_line/cv/cv_100_error.png

docs/tutorial/command_line/cv/cv_10_error.png

docs/tutorial/command_line/cv/error_cv_dist.png

src/CMakeLists.txt

src/classification/ConvexHull1D.cpp

src/classification/ConvexHull1D.hpp

src/classification/LPWrapper.cpp

src/classification/SVMWrapper.cpp

src/classification/SVMWrapper.hpp

src/descriptor_identifier/model/Model.cpp

src/descriptor_identifier/model/ModelClassifier.cpp